Document:

EXHIBIT 4.1

                         ADDISON-DAVIS DIAGNOSTICS, INC.

                        2003 INCENTIVE EQUITY STOCK PLAN

                          AS AMENDED ON APRIL 26, 2006

1. PURPOSE.

The purpose of this Plan is to provide incentives to attract, retain and
motivate eligible persons whose present and potential contributions are
important to the success of the Company, and its Parent and Subsidiaries (if
any), by offering them an opportunity to participate in the Company's future
performance through awards of Options, the right to purchase Common Stock and
Stock Bonuses. Capitalized terms not defined in the text are defined in Section
2.

2. DEFINITIONS.

As used in this Plan, the following terms will have the following meanings:

"AWARD" means any award under this Plan, including any Option, Stock Award or
Stock Bonus.

"AWARD AGREEMENT" means, with respect to each Award, the signed written
agreement between the Company and the Participant setting forth the terms and
conditions of the Award.

"BOARD" means the Board of Directors of the Company.

"CAUSE" means any cause, as defined by applicable law, for the termination of a
Participant's employment with the Company or a Parent or Subsidiary of the
Company.

"CODE" means the Internal Revenue Code of 1986, as amended.

"COMPANY" means QT 5, Inc., or any successor corporation.

"COMMITTEE" means that committee appointed by the Board of Directors to
administer and interpret the Plan as more particularly described in Section 5 of
the Plan; provided, however, that the term Committee will refer to the Board of
Directors during such times as no Committee is appointed by the Board of
Directors.

"DISABILITY" means a disability, whether temporary or permanent, partial or
total, as determined by the Committee.

"EXCHANGE ACT" means the Securities Exchange Act of 1934, as amended.

"EXERCISE PRICE" means the price at which a holder of an Option may purchase the
Shares issuable upon exercise of the Option.
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"FAIR MARKET VALUE" means, as of any date, the value of a share of the Company's
Common Stock determined as follows:

(a) if such Common Stock is publicly traded and is then listed on a national
securities exchange, its closing price on the date of determination on the
principal national securities exchange on which the Common Stock is listed or
admitted to trading;

(b) if such Common Stock is quoted on the NASDAQ National Market or the NASDAQ
SmallCap Market, its closing price on the NASDAQ National Market or the NASDAQ
SmallCap Market, respectively, on the date of determination;

(c) if such Common Stock is publicly traded but is not listed or admitted to
trading on a national securities exchange, the average of the closing bid and
asked prices on the date of determination, provided however, if at the sole
discretion of the Committee, if a active public market does not accurately
reflect the bid/ask prices, then the fair market value shall be determined by
the Committee in good faith; or

(d) if none of the foregoing is applicable, by the Committee in good faith.

"INSIDER" means an officer or director of the Company or any other person whose
transactions in the Company's Common Stock are subject to Section 16 of the
Exchange Act.

"OPTION" means an award of an option to purchase Shares pursuant to Section 6.

"PARENT" means any corporation (other than the Company) in an unbroken chain of
corporations ending with the Company if each of such corporations other than the
Company owns stock possessing 50% or more of the total combined voting power of
all classes of stock in one of the other corporations in such chain.

"PARTICIPANT" means a person who receives an Award under this Plan.

"PERFORMANCE FACTORS" means the factors selected by the Committee, in its sole
and absolute discretion, from among the following measures to determine whether
the performance goals applicable to Awards have been satisfied:

(a) Net revenue and/or net revenue growth;

(b) Earnings before income taxes and amortization and/or earnings before income
taxes and amortization growth;

(c) Operating income and/or operating income growth;

(d) Net income and/or net income growth;

(e) Earnings per share and/or earnings per share growth;

(f) Total stockholder return and/or total stockholder return growth;

(g) Return on equity;
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(h) Operating cash flow return on income;

(i) Adjusted operating cash flow return on income;

(j) Economic value added; and

(k) Individual business objectives.

"PERFORMANCE PERIOD" means the period of service determined by the Committee,
not to exceed five years, during which years of service or performance is to be
measured for Stock Awards or Stock Bonuses, if such Awards are restricted.

"PLAN" means this Addison-Davis Diagnostics, Inc. 2003 Incentive Equity Plan, as
amended from time to time.

"PURCHASE PRICE" means the price at which the Participant of a Stock Award may
purchase the Shares.

"SEC" means the Securities and Exchange Commission.

"SECURITIES ACT" means the Securities Act of 1933, as amended.

"SHARES" means shares of the Company's Common Stock reserved for issuance under
this Plan, as adjusted pursuant to Sections 3 and 19, and any successor
security.

"STOCK AWARD" means an award of Shares pursuant to Section 7.

"STOCK BONUS" means an award of Shares, or cash in lieu of Shares, pursuant to
Section 8.

"SUBSIDIARY" means any corporation (other than the Company) in an unbroken chain
of corporations beginning with the Company if each of the corporations other
than the last corporation in the unbroken chain owns stock possessing 50% or
more of the total combined voting power of all classes of stock in one of the
other corporations in such chain.

"TERMINATION" or "TERMINATED" means, for purposes of this Plan with respect to a
Participant, that the Participant has for any reason ceased to provide services
as an employee, officer, director, consultant, independent contractor or advisor
to the Company or a Parent or Subsidiary of the Company. An employee will not be
deemed to have ceased to provide services in the case of (i) sick leave, (ii)
military leave, or (iii) any other leave of absence approved by the Company,
provided that such leave is for a period of not more than 90 days, unless
reemployment upon the expiration of such leave is guaranteed by contract or
statute or unless provided otherwise pursuant to a formal policy adopted from
time to time by the Company and issued and promulgated to employees in writing.
In the case of any employee on an approved leave of absence, the Committee may
make such provisions respecting suspension of vesting of the Award while on
leave from the employ of the Company or a Subsidiary as it may deem appropriate,
except that in no event may an Option be exercised after the expiration of the
term set forth in the Option agreement. The Committee will have sole discretion
to determine whether a Participant has ceased to provide services and the
effective date on which the Participant ceased to provide services (the
"Termination Date").
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3. SHARES SUBJECT TO THE PLAN.

3.1 Number of Shares Available. Subject to Sections 3.2 and 19, the total
aggregate number of Shares reserved and available for grant and issuance
pursuant to this Plan shall be 26,150,000 Shares and will include Shares that
are subject to: (a) issuance upon exercise of an Option but cease to be subject
to such Option for any reason other than exercise of such Option; (b) an Award
granted hereunder but forfeited or repurchased by the Company at the original
issue price; and (c) an Award that otherwise terminates without Shares being
issued. At all times the Company shall reserve and keep available a sufficient
number of Shares as shall be required to satisfy the requirements of all
outstanding Options granted under this Plan and all other outstanding but
unvested Awards granted under this Plan.

3.2 Adjustment of Shares. In the event that the number of outstanding shares is
changed by a stock dividend, recapitalization, stock split, reverse stock split,
subdivision, combination, reclassification or similar change in the capital
structure of the Company without consideration, then (a) the number of Shares
reserved for issuance under this Plan, (b) the Exercise Prices of and number of
Shares subject to outstanding Options, and (c) the number of Shares subject to
other outstanding Awards will be proportionately adjusted, subject to any
required action by the Board or the stockholders of the Company and compliance
with applicable securities laws; provided, however, that fractions of a Share
will not be issued but will either be replaced by a cash payment equal to the
Fair Market Value of such fraction of a Share or will be rounded up to the
nearest whole Share, as determined by the Committee.

4. ELIGIBILITY.

ISOs (as defined in Section 6 below) may be granted only to employees (including
officers and directors who are also employees) of the Company or of a Parent or
Subsidiary of the Company. All other Awards may be granted to employees,
officers, directors, consultants, independent contractors and advisors of the
Company or any Parent or Subsidiary of the Company, provided such consultants,
independent contractors and advisors render bona-fide services not in connection
with the offer and sale of securities in a capital-raising transaction or
promotion of the Company's securities. A person may be granted more than one
Award under this Plan.

5. ADMINISTRATION.

5.1 Committee.

(a) The Plan shall be administered and interpreted by a committee consisting of
two (2) or more members of the Board.

(b) Members of the Committee may resign at any time by delivering written notice
to the Board. Vacancies in the Committee shall be filled by the Board. The
Committee shall act by a majority of its members in office. The Committee may
act either by vote at a meeting or by a memorandum or other written instrument
signed by a majority of the Committee.

(c) If the Board, in its discretion, does not appoint a Committee, the Board
itself will administer and interpret the Plan and take such other actions as the
Committee is authorized to take hereunder; provided that the Board may take such
actions hereunder in the same manner as the Board may
<PAGE>

take other actions under the Certificate of Incorporation and bylaws of the
Company generally.

5.2 Committee Authority. Without limitation, the Committee will have the
authority to:

(a) construe and interpret this Plan, any Award Agreement and any other
agreement or document executed pursuant to this Plan;

(b) prescribe, amend and rescind rules and regulations relating to this Plan or
any Award;

(c) select persons to receive Awards;

(d) determine the form and terms of Awards;

(e) determine the number of Shares or other consideration subject to Awards;

(f) determine whether Awards will be granted singly, in combination with, in
tandem with, in replacement of, or as alternatives to, other Awards under this
Plan or any other incentive or compensation plan of the Company or any Parent or
Subsidiary of the Company;

(g) grant waivers of Plan or Award conditions;

(h) determine the vesting, exercisability and payment of Awards;

(i) correct any defect, supply any omission or reconcile any inconsistency in
this Plan, any Award or any Award Agreement;

(j) determine whether an Award has been earned; and

(k) make all other determinations necessary or advisable for the administration
of this Plan.

5.3 Committee Discretion. Any determination made by the Committee with respect
to any Award will be made at the time of grant of the Award or, unless in
contravention of any express term of this Plan or Award, at any later time, and
such determination will be final and binding on the Company and on all persons
having an interest in any Award under this Plan. The Committee may delegate to
one or more officers of the Company the authority to grant an Award under this
Plan to Participants who are not Insiders of the Company. No member of the
Committee shall be personally liable for any action taken or decision made in
good faith relating to this Plan, and all members of the Committee shall be
fully protected and indemnified to the fullest extent permitted under applicable
law by the Company in respect to any such action, determination, or
interpretation.

6. OPTIONS.

The Committee may grant Options to eligible persons and will determine whether
such Options will be Incentive Stock Options within the meaning of the Code
("ISO") or Nonqualified Stock Options ("NQSOs"), the number of Shares
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subject to the Option, the Exercise Price of the Option, the period during which
the Option may be exercised, and all other terms and conditions of the Option,
subject to the following:

6.1 Form of Option Grant. Each Option granted under this Plan will be evidenced
by an Award Agreement which will expressly identify the Option as an ISO or an
NQSO (hereinafter referred to as the "Stock Option Agreement"), and will be in
such form and contain such provisions (which need not be the same for each
Participant) as the Committee may from time to time approve, and which will
comply with and be subject to the terms and conditions of this Plan.

6.2 Date of Grant. The date of grant of an Option will be the date on which the
Committee makes the determination to grant such Option, unless otherwise
specified by the Committee. The Stock Option Agreement and a copy of this Plan
will be delivered to the Participant within a reasonable time after the granting
of the Option.

6.3 Exercise Period. Options may be exercisable within the times or upon the
events determined by the Committee as set forth in the Stock Option Agreement
governing such Option; provided, however, that no Option will be exercisable
after the expiration of ten (10) years from the date the Option is granted; and
provided further that no ISO granted to a person who directly or by attribution
owns more than ten percent (10%) of the total combined voting power of all
classes of stock of the Company or of any Parent or Subsidiary of the Company
("Ten Percent Stockholder") will be exercisable after the expiration of five (5)
years from the date the ISO is granted. The Committee also may provide for
Options to become exercisable at one time or from time to time, periodically or
otherwise, in such number of Shares or percentage of Shares as the Committee
determines, provided, however, that in all events a Participant will be entitled
to exercise an Option at the rate of at least 20% per year over five years from
the date of grant, subject to reasonable conditions such as continued
employment; and further provided that an Option granted to a Participant who is
an officer or director may become fully exercisable, subject to reasonable
conditions such as continued employment, at any time or during any period
established by the Company.

6.4 Exercise Price. The Exercise Price of an Option will be determined by the
Committee when the Option is granted and may be not less than 85% of the Fair
Market Value of the Shares on the date of grant; provided that: (a) the Exercise
Price of an ISO will be not less than 100% of the Fair Market Value of the
Shares on the date of grant; and (b) the Exercise Price of any Option granted to
a Ten Percent Stockholder will not be less than 110% of the Fair Market Value of
the Shares on the date of grant. Payment for the Shares purchased may be made in
accordance with Section 9 of this Plan.

6.5 Method of Exercise. Options may be exercised only by delivery to the Company
of a written stock option exercise agreement (the "Exercise Agreement") in a
form approved by the Committee, (which need not be the same for each
Participant), stating the number of Shares being purchased, the restrictions
imposed on the Shares purchased under such Exercise Agreement, if any, and such
representations and agreements regarding the Participant's investment intent and
access to information and other matters, if any, as may be required or desirable
by the Company to comply with applicable securities laws, together with payment
in full of the Exercise Price for the number of Shares being purchased.
<PAGE>

6.6 Termination. Notwithstanding the exercise periods set forth in the Stock
Option Agreement, exercise of an Option will always be subject to the following:

(a) If the Participant's service is Terminated for any reason except death or
Disability, then the Participant may exercise such Participant's Options only to
the extent that such Options would have been exercisable upon the Termination
Date no later than three (3) months after the Termination Date (or such longer
time period not exceeding five (5) years as may be determined by the Committee,
with any exercise beyond three (3) months after the Termination Date deemed to
be an NQSO).

(b) If the Participant's service is Terminated because of the Participant's
death or Disability (or the Participant dies within three (3) months after a
Termination other than for Cause or because of Participant's Disability), then
the Participant's Options may be exercised only to the extent that such Options
would have been exercisable by the Participant on the Termination Date and must
be exercised by the Participant (or the Participant's legal representative) no
later than twelve (12) months after the Termination Date (or such longer time
period not exceeding five (5) years as may be determined by the Committee, with
any such exercise beyond (i) three (3) months after the Termination Date when
the Termination is for any reason other than the Participant's death or
Disability, or (ii) twelve (12) months after the Termination Date when the
Termination is for Participant's death or Disability, deemed to be an NQSO).

(c) Notwithstanding the provisions in paragraph 6.6(a) above, if the
Participant's service is Terminated for Cause, neither the Participant, the
Participant's estate nor such other person who may then hold the Option shall be
entitled to exercise any Option with respect to any Shares whatsoever, after
Termination, whether or not after Termination the Participant may receive
payment from the Company or a Subsidiary for vacation pay, for services rendered
prior to Termination, for services rendered for the day on which Termination
occurs, for salary in lieu of notice, or for any other benefits. For the purpose
of this paragraph, Termination shall be deemed to occur on the date when the
Company dispatches notice or advice to the Participant that his service is
Terminated.

6.7 Limitations on Exercise. The Committee may specify a reasonable minimum
number of Shares that may be purchased on any exercise of an Option, provided
that such minimum number will not prevent the Participant from exercising the
Option for the full number of Shares for which it is then exercisable.

6.8 Limitations on ISO. The aggregate Fair Market Value (determined as of the
date of grant) of Shares with respect to which ISO are exercisable for the first
time by a Participant during any calendar year (under this Plan or under any
other incentive stock option plan of the Company, Parent or Subsidiary of the
Company) will not exceed $100,000. If the Fair Market Value of Shares on the
date of grant with respect to which ISO are exercisable for the first time by a
Participant during any calendar year exceeds $100,000, then the Options for the
first $100,000 worth of Shares to become exercisable in such calendar year will
be ISO and the Options for the amount in excess of $100,000 that become
exercisable in that calendar year will be NQSOs. In the event that the Code or
the regulations promulgated thereunder are amended after the Effective Date of
this Plan to provide for a different limit on the Fair Market Value of Shares
permitted to be subject to ISO, such different limit will be automatically
incorporated herein and will apply to any Options granted after the effective
date of such amendment.
<PAGE>

6.9 Modification, Extension or Renewal. The Committee may modify, extend or
renew outstanding Options and authorize the grant of new Options in substitution
therefore, provided that any such action may not, without the written consent of
a Participant, impair any of such Participant's rights under any Option
previously granted. Any outstanding ISO that is modified, extended, renewed or
otherwise altered will be treated in accordance with Section 424(h) of the Code.
The Committee may reduce the Exercise Price of outstanding Options without the
consent of Participants affected by a written notice to them; provided, however,
that the Exercise Price may not be reduced below the minimum Exercise Price that
would be permitted under Section 6.4 of this Plan for Options granted on the
date the action is taken to reduce the Exercise Price.

6.10 No Disqualification. Notwithstanding any other provision in this Plan, no
term of this Plan relating to ISO will be interpreted, amended or altered, nor
will any discretion or authority granted under this Plan be exercised, so as to
disqualify this Plan under Section 422 of the Code or, without the consent of
the Participant affected, to disqualify any ISO under Section 422 of the Code.

7. STOCK AWARD.

A Stock Award is an offer by the Company to sell to an eligible person Shares
that may or may not be subject to restrictions. The Committee will determine to
whom an offer will be made, the number of Shares the person may purchase, the
price to be paid (the "Purchase Price"), the restrictions to which the Shares
will be subject, if any, and all other terms and conditions of the Stock Award,
subject to the following:

7.1 Form of Stock Award. All purchases under a Stock Award made pursuant to this
Plan will be evidenced by an Award Agreement (the "Stock Purchase Agreement")
that will be in such form (which need not be the same for each Participant) as
the Committee will from time to time approve, and will comply with and be
subject to the terms and conditions of this Plan. The offer of a Stock Award
will be accepted by the Participant's execution and delivery of the Stock
Purchase Agreement (or similar agreement) and payment for the Shares to the
Company in accordance with the Stock Purchase Agreement.

7.2 Purchase Price. The Purchase Price of Shares sold pursuant to a Stock Award
will be determined by the Committee on the date the Stock Award is granted and
may not be less than 85% of the Fair Market Value of the Shares on the grant
date, except in the case of a sale to a Ten Percent Stockholder, in which case
the Purchase Price will be 100% of the Fair Market Value. Payment of the
Purchase Price must be made in accordance with Section 9 of this Plan.

7.3 Terms of Stock Awards. Stock Awards may be subject to such restrictions as
the Committee may impose. These restrictions may be based upon completion of a
specified number of years of service with the Company or upon completion of the
performance goals as set out in advance in the Participant's individual Stock
Purchase Agreement. Stock Awards may vary from Participant to Participant and
between groups of Participants. Prior to the grant of a Stock Award subject to
restrictions, the Committee shall: (a) determine the nature, length and starting
date of any Performance Period for the Stock Award; (b) select from among the
Performance Factors to be used to measure performance goals, if any; and (c)
determine the number of Shares that may be awarded to the
<PAGE>

Participant. Prior to the transfer of any Stock Award, the Committee shall
determine the extent to which such Stock Award has been earned. Performance
Periods may overlap and Participants may participate simultaneously with respect
to Stock Awards that are subject to different Performance Periods and have
different performance goals and other criteria.

7.4 Termination During Performance Period. If a Participant is Terminated during
a Performance Period for any reason, then such Participant will be entitled to
payment (whether in Shares, cash or otherwise) with respect to the Stock Award
only to the extent earned as of the date of Termination in accordance with the
Stock Purchase Agreement, unless the Committee determines otherwise.

8. STOCK BONUSES.

8.1 Awards of Stock Bonuses. A Stock Bonus is an award of Shares for
extraordinary services rendered to the Company or any Parent or Subsidiary of
the Company. A Stock Bonus will be awarded pursuant to an Award Agreement (the
"Stock Bonus Agreement") that will be in such form (which need not be the same
for each Participant) as the Committee will from time to time approve, and will
comply with and be subject to the terms and conditions of this Plan. A Stock
Bonus may be awarded upon satisfaction of such performance goals as are set out
in advance in the Participant's individual Award Agreement (the "Performance
Stock Bonus Agreement") that will be in such form (which need not be the same
for each Participant) as the Committee will from time to time approve, and will
comply with and be subject to the terms and conditions of this Plan. Stock
Bonuses may vary from Participant to Participant and between groups of
Participants, and may be based upon the achievement of the Company, Parent or
Subsidiary and/or individual performance factors or upon such other criteria as
the Committee may determine.

8.2 Terms of Stock Bonuses. The Committee will determine the number of Shares to
be awarded to the Participant. If the Stock Bonus is being earned upon the
satisfaction of performance goals pursuant to a Performance Stock Bonus
Agreement, then the Committee will: (a) determine the nature, length and
starting date of any Performance Period for each Stock Bonus; (b) select from
among the Performance Factors to be used to measure the performance, if any; and
(c) determine the number of Shares that may be awarded to the Participant. Prior
to the payment of any Stock Bonus, the Committee shall determine the extent to
which such Stock Bonuses have been earned. Performance Periods may overlap and
Participants may participate simultaneously with respect to Stock Bonuses that
are subject to different Performance Periods and different performance goals and
other criteria. The number of Shares may be fixed or may vary in accordance with
such performance goals and criteria as may be determined by the Committee. The
Committee may adjust the performance goals applicable to the Stock Bonuses to
take into account changes in law and accounting or tax rules and to make such
adjustments as the Committee deems necessary or appropriate to reflect the
impact of extraordinary or unusual items, events or circumstances to avoid
windfalls or hardships.

8.3 Form of Payment. The earned portion of a Stock Bonus may be paid to the
Participant by the Company either currently or on a deferred basis, with such
interest or dividend equivalent, if any, as the Committee may determine. Payment
of an interest or dividend equivalent (if any) may be made in the form of cash
or whole Shares or a combination thereof, either in a lump sum payment or in
installments, all as the Committee will determine.

9. PAYMENT FOR SHARE PURCHASES.

Payment for Shares purchased pursuant to this Plan may be made in cash (by
check) or, where expressly approved for the Participant by the Committee and
where permitted by law:
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(a) by cancellation of indebtedness of the Company to the Participant;

(b) by surrender of shares that either: (1) have been owned by the Participant
for more than six (6) months and have been paid for within the meaning of SEC
Rule 144; or (2) were obtained by the Participant in the public market;

(c) by waiver of compensation due or accrued to the Participant for services
rendered;

(d) with respect only to purchases upon exercise of an Option, and provided that
a public market for the Company's stock exists:

(1) through a "same day sale" commitment from the Participant and a
broker-dealer that is a member of the National Association of Securities Dealers
(an "NASD Dealer") whereby the Participant irrevocably elects to exercise the
Option and to sell a portion of the Shares so purchased to pay for the Exercise
Price, and whereby the NASD Dealer irrevocably commits upon receipt of such
Shares to forward the Exercise Price directly to the Company; or

(2) through a "margin" commitment from the Participant and a NASD Dealer whereby
the Participant irrevocably elects to exercise the Option and to pledge the
Shares so purchased to the NASD Dealer in a margin account as security for a
loan from the NASD Dealer in the amount of the Exercise Price, and whereby the
NASD Dealer irrevocably commits upon receipt of such Shares to forward the
Exercise Price directly to the Company; or

(e) by any combination of the foregoing.

10. WITHHOLDING TAXES.

10.1 Withholding Generally. Whenever Shares are to be issued in satisfaction of
Awards granted under this Plan, the Company may require the Participant to remit
to the Company an amount sufficient to satisfy federal, state and local
withholding tax requirements prior to the delivery of any certificate or
certificates for such Shares. Whenever, under this Plan, payments in
satisfaction of Awards are to be made in cash, such payment will be net of an
amount sufficient to satisfy federal, state, and local withholding tax
requirements.

10.2 Stock Withholding. When, under applicable tax laws, a participant incurs
tax liability in connection with the exercise or vesting of any Award that is
subject to tax withholding and the Participant is obligated to pay the Company
the amount required to be withheld, the Committee may allow the Participant to
satisfy the minimum withholding tax obligation by electing to have the Company
withhold from the Shares to be issued that number of Shares having a Fair Market
Value equal to the minimum amount required to be withheld, determined on the
date that the amount of tax to be withheld is to be determined. All elections by
a Participant to have Shares withheld for this purpose will be made in
accordance with the requirements established by the Committee and will be in
writing in a form acceptable to the Committee.

11. PRIVILEGES OF STOCK OWNERSHIP.

11.1 Voting and Dividends. No Participant will have any of the rights of a
stockholder with respect to any Shares until the Shares are issued to the
Participant. After Shares are issued to the Participant, the Participant will be
a stockholder and will have all the rights of a stockholder with respect to such
<PAGE>

Shares, including the right to vote and receive all dividends or other
distributions made or paid with respect to such Shares; provided, that if such
Shares are issued pursuant to a Stock Award with restrictions, then any new,
additional or different securities the Participant may become entitled to
receive with respect to such Shares by virtue of a stock dividend, stock split
or any other change in the corporate or capital structure of the Company will be
subject to the same restrictions as the Stock Award; provided, further, that the
Participant will have no right to retain such stock dividends or stock
distributions with respect to Shares that are repurchased at the Participant's
Purchase Price or Exercise Price pursuant to Section 13.

11.2 Financial Statements. The Company will provide financial statements to each
Participant prior to such Participant's purchase of Shares under this Plan, and
to each Participant annually during the period such Participant has Awards
outstanding; provided, however, the Company will not be required to provide such
financial statements to Participants whose services in connection with the
Company assure them access to equivalent information.

12. NON-TRANSFERABILITY.

Awards of Shares granted under this Plan, and any interest therein, will not be
transferable or assignable by the Participant, and may not be made subject to
execution, attachment or similar process, other than by will or by the laws of
descent and distribution. Awards of Options granted under this Plan, and any
interest therein, will not be transferable or assignable by the Participant, and
may not be made subject to execution, attachment or similar process, other than
by will or by the laws of descent and distribution, by instrument to an inter
vivos or testamentary trust in which the options are to be passed to
beneficiaries upon the death of the trustor, or by gift to "immediate family" as
that term is defined in 17 C.F.R. 240.16a-1(e). During the lifetime of the
Participant an Award will be exercisable only by the Participant. During the
lifetime of the Participant, any elections with respect to an Award may be made
only by the Participant unless otherwise determined by the Committee and set
forth in the Award Agreement with respect to Awards that are not ISOs.

13. REPURCHASE RIGHTS.

At the discretion of the Committee, the Company may reserve to itself and/or its
assignee(s) in the Award Agreement a right to repurchase a portion of or all of
the unvested Shares held by a Participant following such Participant's
Termination Date. Such repurchase by the Company shall be for cash and/or
cancellation of purchase money indebtedness and the price per share shall be the
Participant's Exercise Price or Purchase Price, as applicable.

14. CERTIFICATES.

All certificates for Shares or other securities delivered under this Plan will
be subject to such stop transfer orders, legends and other restrictions as the
Committee may deem necessary or advisable, including restrictions under any
applicable federal, state or foreign securities law, or any rules, regulations
and other requirements of the SEC or any stock exchange or automated quotation
system upon which the Shares may be listed or quoted.

15. ESCROW; PLEDGE OF SHARES.

To enforce any restrictions on a Participant's Shares, the Committee may require
the Participant to deposit all certificates representing Shares, together with
stock powers or other instruments of transfer approved by the
<PAGE>

Committee appropriately endorsed in blank, with the Company or an agent
designated by the Company to hold in escrow until such restrictions have lapsed
or terminated, and the Committee may cause a legend or legends referencing such
restrictions to be placed on the certificates.

16. EXCHANGE AND BUYOUT OF AWARDS.

The Committee may, at any time or from time to time, authorize the Company, with
the consent of the respective Participants, to issue new Awards in exchange for
the surrender and cancellation of any or all outstanding Awards. The Committee
may at any time buy from a Participant an Award previously granted with payment
in cash, Shares or other consideration, based on such terms and conditions as
the Committee and the Participant may agree.

17. SECURITIES LAW AND OTHER REGULATORY COMPLIANCE.

An Award will not be effective unless such Award is in compliance with all
applicable federal and state securities laws, rules and regulations of any
governmental body, and the requirements of any stock exchange or automated
quotation system upon which the Shares may then be listed or quoted, as they are
in effect on the date of grant of the Award and also on the date of exercise or
other issuance. Notwithstanding any other provision in this Plan, the Company
will have no obligation to issue or deliver certificates for Shares under this
Plan prior to: (a) obtaining any approvals from governmental agencies that the
Company determines are necessary or advisable; and/or (b) completion of any
registration or other qualification of such Shares under any state or federal
law or ruling of any governmental body that the Company determines to be
necessary or advisable. The Company will be under no obligation to register the
Shares with the SEC or to effect compliance with the registration, qualification
or listing requirements of any state securities laws, stock exchange or
automated quotation system, and the Company will have no liability for any
inability or failure to do so.
<PAGE>

18. NO OBLIGATION TO EMPLOY.

Nothing in this Plan or any Award granted under this Plan will confer or be
deemed to confer on any Participant any right to continue in the employ of, or
to continue any other relationship with, the Company or any Parent or Subsidiary
of the Company or limit in any way the right of the Company or any Parent or
Subsidiary of the Company to terminate Participant's employment or other
relationship at any time, with or without cause.

19. CORPORATE TRANSACTIONS.

19.1 Assumption or Replacement of Awards by Successor. In the event of (a) a
dissolution or liquidation of the Company, (b) a merger or consolidation in
which the Company is not the surviving corporation (other than a merger or
consolidation with a wholly-owned subsidiary, a reincorporation of the Company
in a different jurisdiction, or other transaction in which there is no
substantial change in the stockholders of the Company or their relative stock
holdings and the Awards granted under this Plan are assumed, converted or
replaced by the successor corporation, which assumption will be binding on all
Participants), (c) a merger in which the Company is the surviving corporation
but after which the stockholders of the Company immediately prior to such merger
(other than any stockholder that merges, or which owns or controls another
corporation that merges, with the Company in such merger) cease to own their
shares or other equity interest in the Company, (d) the sale of substantially
all of the assets of the Company, or (e) the acquisition, sale, or transfer of
more than 50% of the outstanding shares of the Company by tender offer or
similar transaction, any or all outstanding Awards may be assumed, converted or
replaced by the successor corporation (if any), which assumption, conversion or
replacement will be binding on all Participants. In the alternative, the
successor corporation may substitute equivalent Awards or provide substantially
similar consideration to Participants as was provided to stockholders (after
taking into account the existing provisions of the Awards). The successor
corporation may also issue, in place of outstanding Shares of the Company held
by the Participant, substantially similar shares or other property subject to
repurchase restrictions no less favorable to the Participant. In the event such
successor corporation (if any) refuses to assume or substitute Awards, as
provided above, pursuant to a transaction described in this Subsection 19.1, (i)
the vesting of any or all Awards granted pursuant to this Plan will accelerate
upon a transaction described in this Section 19 and (ii) any or all Options
granted pursuant to this Plan will become exercisable in full prior to the
consummation of such event at such time and on such conditions as the Committee
determines. If such Options are not exercised prior to the consummation of the
corporate transaction, they shall terminate at such time as determined by the
Committee.

19.2 Other Treatment of Awards. Subject to any greater rights granted to
Participants under the foregoing provisions of this Section 19, in the event of
the occurrence of any transaction described in Section 19.1, any outstanding
Awards will be treated as provided in the applicable agreement or plan of
merger, consolidation, dissolution, liquidation, or sale of assets.

19.3 Assumption of Awards by the Company. The Company, from time to time, also
may substitute or assume outstanding awards granted by another company, whether
in connection with an acquisition of such other company or otherwise, by either;
(a) granting an Award under this Plan in substitution of such other company's
award; or (b) assuming such award as if it had been granted under this Plan if
the terms of such assumed award could be applied to an Award granted under this
Plan. Such substitution or assumption will be permissible if the holder of the
substituted or assumed award would have been eligible to be granted an Award
under this Plan if the other company had applied the rules of
<PAGE>

this Plan to such grant. In the event the Company assumes an award granted by
another company, the terms and conditions of such award will remain unchanged
(except that the exercise price and the number and nature of Shares issuable
upon exercise of any such option will be adjusted appropriately pursuant to
Section 424(a) of the Code). In the event the Company elects to grant a new
Option rather than assuming an existing option, such new Option may be granted
with a similarly adjusted Exercise Price.

20. ADOPTION AND STOCKHOLDER APPROVAL.

This Plan will become effective on the date on which it is adopted by the Board
(the "Effective Date"). Upon the Effective Date, the Committee may grant Awards
pursuant to this Plan. The Company intends to seek stockholder approval of the
Plan within twelve (12) months after the date this Plan is adopted by the Board;
provided, however, if the Company fails to obtain stockholder approval of the
Plan during such 12-month period, pursuant to Section 422 of the Code, any
Option granted as an ISO at any time under the Plan will not qualify as an ISO
within the meaning of the Code and will be deemed to be an NQSO.

21. TERM OF PLAN/GOVERNING LAW.

Unless earlier terminated as provided herein, this Plan will terminate ten (10)
years from the date this Plan is adopted by the Board or, if earlier, the date
of stockholder approval. This Plan and all agreements thereunder shall be
governed by and construed in accordance with the laws of the State of
California.

22. AMENDMENT OR TERMINATION OF PLAN.

The Board may at any time terminate or amend this Plan in any respect, including
without limitation amendment of any form of Award Agreement or instrument to be
executed pursuant to this Plan; provided, however, that the Board will not,
without the approval of the stockholders of the Company, amend this Plan in any
manner that requires such stockholder approval.

23. NONEXCLUSIVITY OF THE PLAN.

Neither the adoption of this Plan by the Board, the submission of this Plan to
the stockholders of the Company for approval, nor any provision of this Plan
will be construed as creating any limitations on the power of the Board to adopt
such additional compensation arrangements as it may deem desirable, including,
without limitation, the granting of stock options and bonuses otherwise than
under this Plan, and such arrangements may be either generally applicable or
applicable only in specific cases.

24. ACTION BY COMMITTEE.

Any action permitted or required to be taken by the Committee or any decision or
determination permitted or required to be made by the Committee pursuant to this
Plan shall be taken or made in the Committee's sole and absolute discretion.EXHIBIT 4.20

                  WARRANT TO PURCHASE SHARES OF COMMON STOCK OF
                         AMERICAN BIO MEDICA CORPORATION

      Warrant No. 001                                    Dated: October 28, 2000
      Amend No. 5

      This certifies that Steven Grodko (the "Holder"),  for value received,  is
entitled,  subject to the terms set forth below,  to purchase  from AMERICAN BIO
MEDICA  CORPORATION,  a New York  Corporation (the  "Company"),  400,000,  (Four
hundred  thousand)  fully paid and  nonassessable  Common  Shares (the  "Warrant
Shares") of the Company,  par value $.01 per share (the "Stock"),  at a price of
$0.95 per share (the "Stock  Purchase  Price") at any time but not earlier  than
that  Commencement Date (as defined below) or later than 5:00 pm (New York Time)
on the  Expiration  Date (as defined below) upon surrender to the Company at its
principal  office at 122 Smith  Road,  Kinderhook,  New York  12106,  Attention:
Corporate  Secretary  (or at such other  location  as the Company may advise the
Holder in writing) of this Warrant  properly  endorsed with the form of Exercise
Notice  attached  hereto  duly  completed  and  signed  upon  payment in cash or
cashier's  check of the aggregate  Stock Purchase Price for the number of shares
for which the  Warrant is being  exercised  determined  in  accordance  with the
provisions  hereof.  The Stock  Purchase  Price and the number of Warrant Shares
purchasable hereunder are subject to adjustment as provided in Section 3 of this
Warrant.  This Warrant and all rights hereunder,  to the extent not exercised in
the manner set forth  herein  shall  terminate  and become  null and void on the
Expiration Date (as defined below).  "Commencement  Date" shall mean the date of
this  Warrant.  "Expiration  Date"  shall  mean  the  sixth  anniversary  of the
Commencement Date.

      This  Warrant is subject to the following terms and conditions:

      1.    Exercise; Issuance of Certificates; Payment for Warrant Shares.

      (a) This Warrant is  exercisable by payment of the Stock Purchase Price by
cash payment, certified check or wire transfer, in the manner set forth above at
the option of the Holder at any time but not earlier than the Commencement  Date
or  later  than  5:00 pm (New  York  Time) on the  Expiration  Date for all or a
portion of the shares of Stock subject to this Warrant.  The Company agrees that
the Warrant  Shares  purchased  under this Warrant shall be and are deemed to be
issued  to the  Holder  as the  record  owner of such  shares as of the close of
business  on the date on which  this  Warrant  shall have been  surrendered  and
payment made for such shares (unless the Conversion Right is exercised). Subject
to the provisions of Section 2, certificates for the Warrant Shares so purchased
shall  be  delivered  to the  Holder  by the  Company's  transfer  agent  at the
Company's   expense  within  a  reasonable  amount  of  time  after  the  rights
represented by this Warrant have been  exercised.  The stock  certificate(s)  so
delivered  shall be  registered  in the name of the Holder or such other name as
shall be  designated  by the Holder,  subject to the  limitations  contained  in
Section 2. If, upon  exercise of this  Warrant,  fewer than all of the shares of
Stock  evidenced by this Warrant are purchased  prior to the Expiration  Date of
this Warrant, one or more new warrants  substantially in the form of, and on the
terms of,  this  Warrant  will be issued for the  remaining  number of shares of
Stock not purchased upon exercise of this Warrant.

                                                                               1
                                  Exhibit 4.20

<PAGE>

      (b) Subject to the mutual agreement of the Company and the Holder, in lieu
of the payment of the Stock Purchase  Price,  the Holder may require the Company
to  convert  this  Warrant  into  shares of Stock  (the  "Conversion  Right") as
provided for in this Section 1(b).  Upon exercise of the Conversion  Right,  the
Company shall deliver to the Holder (without payment by the Holder of any of the
Stock  Purchase  Price)  that  number  of share of Stock  equal to the  quotient
obtained  by dividing  (x) the value of the  Warrant at the time the  Conversion
Right is exercised (determined by subtracting the aggregate Stock Purchase Price
in effect  immediately  prior to the exercise of the  Conversion  Right from the
aggregate Market Value (as defined in Section 1(d) below) for the Warrant Shares
immediately  prior to the  exercise of the  Conversion  Right) by (y) the Market
Value.

      (c) The Conversion  Right may be exercised by the Holder by delivering the
Warrant  Certificate  with a duly executed  Exercise Notice in the form attached
hereto with the conversion section completed by the Company.

      (d) For the sole purpose of determining the number of Warrant Shares which
shall be delivered to the Holder by the Company pursuant to the Conversion Right
as ser forth in Section 1(b) above,  "Market Value" shall mean the average daily
closing price of a share of the Stock listed on the Nasdaq  SmallCap  Market (or
such other  exchange or quotation  system on which the Stock may then be listed)
for the ten (10)  consecutive  days of trading  ending on the third business day
immediately  preceding the date of exercise of such Conversion  Right, or in the
event  the  Stock  is not  then  publicly  traded,  the  Market  Value  shall be
determined in good faith by the Company and the Holder. In the event the Parties
are unable to agree upon the Market Value within thirty (30) days of the date of
exercise of the  Conversion  Right,  the Market Value shall be  determined  by a
nationally  recognized  investment  banking firm by lot from two (2)  investment
baking firms chosen by the Company and two (2)  investment  banking firms chosen
by the Holder, none of which shall have been engaged by either Party within five
(5) years prior to the date of selection.

      2. Shares to be fully paid; Reservation of Shares.

      The  Company  covenants  and agrees  that the Warrant  Shares  will,  upon
issuance,  be duly authorized,  validly issued,  fully paid and nonasessable and
free from all preemptive  rights of any stockholder and free of all taxes (other
than income taxes which may be applicable to the Holder), liens and charges with
respect to the issuance thereof.  The Company covenants that it will reserve and
keep  available a  sufficient  number of shares of its  authorized  but unissued
Stock for such exercise. The Company will take all such reasonable action as may
be  necessary  to  assure  that such  shares of Stock may be issued as  provided
herein  without  violation  of  any  applicable  law  or  regulation,  or of any
requirement of any domestic  securities  exchange or automated  quotation system
upon which the Stock may be listed.

      3. Adjustment of Stock Purchase Price and Number of Shares.

      The Stock  Purchase  Price and the number of shares  purchasable  upon the
exercise of this Warrant,  shall be subject to adjustment from time to time upon
the occurrence of certain events described in this Section 3.

      3.1  Subdivision or Combination of Stock and Stock  Dividend.  In case the
Company  shall at any time  subdivide  its  outstanding  shares of Stock  into a
greater  number of shares or declare a dividend upon its Stock payable solely in
shares of Stock,  the Stock Purchase Price in effect  immediately  prior to such
subdivision of declaration shall be proportionately  reduced,  and the number of
shares issuable upon exercise of the Warrant shall be proportionately increased.
Conversely,  in case the  outstanding  shares of Stock of the  Company  shall be
combined into a smaller  number of shares,  the Stock  Purchase  Price in effect
immediately prior to such combination shall be  proportionately  increased,  and
the  number  of  shares   issuable   upon  exercise  of  the  Warrant  shall  be
proportionately reduced.

                                                                               2
                                  Exhibit 4.20

<PAGE>

      3.2 Anti-dilution Protection. If at any time prior to the exercise of this
Warrant in full,  the Company shall issue or sell any Common Stock or securities
(the "Additional  Securities") convertible in Common Stock for consideration per
share (the "Adjusted Per Share Price") (in cash,  property or other assets) less
than the Stock Purchase Price on the date of such issuance or sale of Additional
Securities,  the  Stock  Purchase  Price  in  effect  immediately  prior to such
issuance  or sales shall be reduced to the  Adjusted  Per Share  Price,  and the
number  of  Warrants   issuable   upon   exercise  of  this  Warrant   shall  be
proportionately  increased  such that the  aggregate  number of  Warrant  Shares
issuable  under this  Warrant  multiplied  by the Adjusted Per Share Price shall
equal  [$905,619]  adjusted for any prior  exercises.  The foregoing  adjustment
shall not be made in the event the Company issues or sells Additional Securities
upon exercise of outstanding  options or warrants as of the Commencement Date or
options  reserved for issuance under the Company's  stock option plans as of the
Commencement  Date. The anti-dilution  protection  contained herein shall not be
applicable  to any shares  already  outstanding  pursuant to an exercise of this
Warrant.

      3.3 Notice of Adjustment.  Promptly after adjustment of the Stock Purchase
Price of any increase or decrease in the number of shares  purchasable  upon the
exercise of this Warrant,  the Company  shall give written  notice  thereof,  by
first class mail, postage prepaid, addressed to the Holder at the address of the
Holder as shown on the books of the  Company.  The notice shall be signed by and
authorized  officer of the  Company and shall  state the  effective  date of the
adjustment and the Stock Purchase Price  resulting from such  adjustment and the
increase or decrease,  if any, in the number of share  purchasable at such price
upon the exercise of this Warrant, setting forth in reasonable detail the method
of calculation and the fact upon which such calculation is based.

      3.4 Other Notices. If at any time:

      (a)   the Company shall declare any cash dividend upon its Stock;

      (b)   the Company  shall  declare any dividend  upon its Stock  payable in
            stock (other than a dividend  payable  solely in shares of Stock) or
            make any special  dividend or other  distribution  to the holders of
            its Stock;

      (c)   there  shall be any  consolidation  or  merger of the  Company  with
            another  corporation,  or a sale of all or substantially  all of the
            Company's assets to another corporation; or

      (d)   there shall be a voluntary or involuntary  dissolution,  liquidation
            or winding-up of the Company.

then, in any one or more of said cases,  the Company shall give, by certified or
registered  mail,  postage prepaid,  addressed to the registered  Holder of this
Warrant at the address of the Holder as shown on the books of the  Company,  (i)
at least ten (10) days  prior  written  notice of the date on which the books of
the  Company  shall  close  or a  record  shall  be  taken  for  such  dividend,
distribution  or  subscription  rights  or for  determining  rights to vote with
respect of any such  dissolution,  liquidation or winding-up,  (ii) at least ten
(10) days  prior  written  notice of the date on which the books of the  Company
shall close or a record shall be taken for determining rights to vote in respect
of any such reorganization, reclassification, consolidation, merger or sale, and
(iii) in the case of any such reorganization,  reclassification,  consolidation,
merger,  sale,  dissolution,  liquidation or winding-up,  at least ten (10) days
written  notice of the date when the same shall take place.  Any notice given in
accordance  with  clause (i) above shall also  specify,  in the case of any such
dividend, distribution, or option rights, the date on which the holders of Stock
shall be entitled  thereto.  Any notice  given in  accordance  with clause (iii)
above  shall  also  specify  the date on which  the  holders  of Stock  shall be
entitled to exchange their Stock for  securities or other  property  deliverable
upon  such  reorganization,   reclassification,   consolidation,   merger,  sale
dissolution, liquidation or winding-up, as the case may be.

                                                                               3
                                  Exhibit 4.20

<PAGE>

      3.5 Changes in Stock.  In case at any time prior to the  Expiration  Date,
the Company shall be a party to any transaction (including without limitation, a
merger, consolidation,  sale of all or substantially all of the Company's assets
or  recapitalization  of the Stock) in which the  previously  outstanding  Stock
shall be changed into or exchanged  for  different  securities of the Company or
common  stock or other  securities  of another  corporation  or  interests  in a
non-corporate  entity or other  property  (including  cash) or the Company shall
make a  distribution  of its shares,  other than regular  cash  dividends on its
outstanding  stock,  or any  combination  of any of  the  foregoing  (each  such
transaction  being herein called the  "Transaction" and the date of consummation
of the  Transaction  being herein  called the  `Consummation  Date",  then, as a
condition of the consummation of the Transaction, lawful and adequate provisions
shall be made so that each Holder,  upon exercise hereof at any time on or after
the  Consummation  Date,  shall be entitled to receive,  and this Warrant  shall
thereafter  represent the right to receive,  in lieu of Stock issuable upon such
exercise  prior to the  Consummation  Date,  the highest amount of securities or
other  property  to which the Holder  would  actually  have been  entitled  as a
stockholder upon the consummation of the Transaction if the Holder had exercised
such Warrant  immediately prior thereto.  The provision of the Section 3.5 shall
similarly apply to successive Transactions.

      4. Investment Representations.

      By receipt of this Warrant, and by its execution, the Holder represents to
the Company the following:

      (a) the Holder  understands that this Warrant and any Stock purchased upon
its exercise are  securities,  the issuance of which  requires  compliance  with
federal and state securities laws;

      (b) the Holder is aware of the  Company's  business  affairs and financial
condition and has acquired sufficient  information about the Company to reach an
informed and knowledgeable decision to acquire this Warrant;

      (c) the Holder is acquiring  this Warrant for  investment  in the Holder's
own account only and not with a view to, or for resale in connection  with,  any
"distribution"  thereof  within the meaning of the  Securities  Act of 1933,  as
amended (the "Act"); and

      (d) the Holder acknowledges and understands that the securities constitute
"restricted  securities" under the Act and must be held indefinitely unless they
are subsequently registered under the Act or an exemption from such registration
is available.

      5. Issue Tax.  The issuance of  certificates  for shares of Stock upon the
exercise  of the  Warrant  shall be made  without  charge  to the  Holder of the
Warrant  for any issue  tax in  respect  thereof;  provided,  however,  that the
Company  shall not be required to pay any tax which may be payable in respect of
any transfer  involved in the issuance and delivery of any certificate in a name
other than that of the then Holder of the Warrant being exercised.

      6.  No  Voting  or  Dividend  Rights;  Limitation  on  Liability.  Nothing
contained in this  Warrant  shall be  construed  as  conferring  upon the Holder
hereof the right to vote or to consent or to receive  notice as a stockholder in
respect of meetings of stockholders for the election or directors of the Company
or any other matters or any rights  whatsoever as a stockholder  of the Company.
In  addition,  if the Holder of the Warrant  does not  exercise  this Warrant or
convert this Warrant  pursuant to Section 1(b) above prior to the  occurrence of
an event described above,  except as provided in Section 3.1 and 3.5, the Holder
shall not be entitled to receive the  benefits  accruing to existing  holders of
the Stock  pursuant to such an event.  No dividends or interest shall be payable
or accrued in respect of this Warrant or the interest  represented hereby or the
shares  purchasable  hereunder  until, and only to the extent that, this Warrant
shall have been exercised.  No provisions  hereof, in the absence of affirmative
action by the Holder to purchase shares of Stock, and no mere enumeration herein
of the  rights  or  privileges  of the  Holder  hereof,  shall  give rise to any
liability of the Holder for the Stock  Purchase Price or as a stockholder of the
Company whether such liability is asserted by the Company or by its creditors.

                                                                               4
                                  Exhibit 4.20

<PAGE>

      7.  Restrictions  on  Transferability   of  Securities;   Compliance  with
Securities Act.

      7.1 Restrictions on  Transferability.  This Warrant and the Warrant Shares
shall not be transferable in the absence of the  effectiveness of a registration
statement  with  respect  to such  securities  under  the Act,  or an  exemption
therefrom.  This Warrant and the Warrant Shares may be transferred in any manner
of compliance with applicable law.

      7.2  Restrictive   Legend.   In  the  absence  of  the   effectiveness  of
registration under the Act, or an exemption therefrom as contemplated by Section
7.1, each  certificate  representing  the Warrant Shares or any other securities
issued in respect of the Warrant  Shares upon any stock split,  stock  dividend,
recapitalization,  merger,  consolidation or similar event,  shall be stamped or
otherwise  imprinted  with a  legend  substantially  in the  following  form (in
addition to any legend required under applicable state securities laws):

      THE  SECURITIES  REPRESENTED  HEREBY  HAVE NOT BEEN  REGISTERED  UNDER THE
      SECURITIES ACT OF 1933, AS AMENDED ("ACT"), NOR UNDER ANY STATE SECURITIES
      LAWS  AND  NEITHER  THE  SECURITIES  NOR  ANY  INTEREST   THEREIN  MAY  BE
      TRANSFERRED,   PLEDGED,  OR  OTHERWISE  DISPOSED  OF  IN  THE  ABSENCE  OF
      REGISTRATION OR AN EXEMPTION THEREFROM UNDER SAID ACT OR SUCH LAWS AND THE
      RULES AND REGULATIONS THEREUNDER.

      8.  Modification and Waiver.  This Warrant and any provision hereof may be
changed,  waived,  discharged  or  terminated  only be an  instrument in writing
signed by the party against which enforcement of the same is sought.

      9. Notices. Any notice, request or other document required or permitted to
be given or delivered to the Holder  hereof or the Company shall be delivered or
shall be sent by certified or registered mail,  postage prepaid,  to each Holder
at its  address as shown on the books of the  Company  or to the  Company at the
address indicated therefore in the first paragraph of this Warrant.

      10.  Descriptive  Headings and Governing Law. The descriptive  headings of
the several sections and paragraphs of this Warrant are inserted for convenience
only  and do not  constitute  a part of this  Warrant.  This  Warrant  shall  be
construed and enforced in accordance  with,  and the rights of the Parties shall
be governed  by, the laws of the State of New Jersey  without  reference  to the
principles of conflicts of law.

      11.  Lost  Warrants or Stock  Certificates.  The  Company  represents  and
warrants to the Holder that upon receipt of evidence reasonably  satisfactory to
the Company of the loss,  theft,  destruction  or  mutilation  of any Warrant or
stock certificate  representing Warrant Shares and in the case of any such loss,
theft,  destruction  or  mutilation,  upon  receipt  of  an  indemnity  and,  if
requested,  bond reasonably  satisfactory to the Company,  or in the case of any
such  mutilation,  upon  surrender  and  cancellation  of such  Warrant or stock
certificate,  the Company, at its expense will make and deliver a new Warrant or
stock  certificate,  or like tenor,  in lieu of the lost,  stolen,  destroyed or
mutilated Warrant or stock certificate.

                                                                               5
                                  Exhibit 4.20

<PAGE>

      12. Fractional  Shares. No fractional shares shall be issued upon exercise
of this Warrant.  The Company shall, in lieu of issuing any fractional share pay
the Holder  entitled  to such  fraction  a sum of cash equal to the fair  market
value of any such  fractional  interest as it shall appear on the public market,
or if there is not public  market for such shares,  then as shall be  reasonably
determined by the Company.

IN WITNESS  WHEREOF,  the Company has caused this  Warrant to be executed by its
officer, thereunto duly authorized as of the date first written above.

                                               AMERICAN BIO MEDICA CORPORATION

                                               By: /s/ Melissa A. Decker
                                                   --------------------------
                                                   Name: Melissa A. Decker
                                                   Title: Corporate Secretary

                                               By: /s/ Keith E. Palmer
                                                   --------------------------
                                                   Name: Keith E. Palmer
                                                   Title: CFO & Director

                                                                               6
                                  Exhibit 4.20

<PAGE>

                             FORM OF EXERCISE NOTICE
              (To be signed and delivered upon exercise of Warrant)

AMERICAN BIO MEDICA CORPORATION
122 Smith Road
Kinderhook, New York 12106

      The  undersigned,  the Holder of the within Warrant  (Warrant  Certificate
Number 001,  Amend No. 5),  hereby  irrevocably  elects to exercise the purchase
right  represented by such Warrant for, and to purchase  thereunder,  __________
Common Shares,  par value $0.01 per share (the "Stock"),  of AMERICAN BIO MEDICA
CORPORATION (the "Company"),  and subject to the following  paragraph,  herewith
makes payment of __________  Dollars  ($__________)  therefore and requests that
the  certificate(s)  for such shares be issued in the name of, and delivered to,
__________ whose address is __________.

      The  undersigned  does/does  not (circle  one) request the exercise of the
within Warrant  pursuant to the "Conversion  Right" set forth in Section 1(b) of
the Warrant.

DATED:
      ---------------------
                                         ---------------------------------------
                                         (Signature must conform in all respects
                                         to name of Holder as specified on the
                                         face of the Warrant)

---------------------------

---------------------------              (Address)

                                                                               7
                                  Exhibit 4.20

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00102-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00102-of-00352.parquet"}]]