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The Effects of Workplace Hazards on Female Reproductive Health DISCLAIMER Mention of any company or product does not constitute en- dorsement by the National Institute for Occupational Safety and Health.

This document is in the public domain and may be freely copied or reprinted.
Copies of this and other NIOSH documents are available from Publications Dissemination, EID National Institute for Occupational Safety and Health 4676 Columbia Parkway Cincinnati, OH 452261998 Fax number: (513) 5338573 Telephone number: 180035NIOSH (18003564674) E-mail: pubstaft@cdc.gov To receive other information about occupational safety and health problems, call 180035NIOSH (18003564674), or visit the NIOSH Homepage on the World Wide Web at http://www.cdc.gov/niosh DHHS (NIOSH) Publication No.
99104 February 1999 INTRODUCTION INTRODUCTION Many factors can affect a womans reproductive Many factors can affect a womans reproductive health and her ability to produce healthy children.

We health and her ability to produce healthy children.

We know that the health of an unborn child can suffer if a know that the health of an unborn child can suffer if a woman fails to eat right, smokes, or drinks alcohol woman fails to eat right, smokes, or drinks alcohol during pregnancy.
However, we know very little during pregnancy.

However, we know very little about the cause of most reproductive health problems about the cause of most reproductive health problems such as infertility, miscarriage, and birth defects.

We such as infertility, miscarriage, and birth defects.
We do know that some workplace hazards can affect a do know that some workplace hazards can affect a womans reproductive health, her ability to become womans reproductive health, her ability to become pregnant, or the health of her unborn children.

pregnant, or the health of her unborn children.

This document answers the following questions: This document answers the following questions: u What are reproductive hazards for female u What are reproductive hazards for female workers?
workers?

u How does the female reproductive system work?

u How does the female reproductive system work?

u What reproductive problems might be caused by u What reproductive problems might be caused by workplace exposures?

workplace exposures?

u How are workers and their babies exposed?

u How are workers and their babies exposed?

u How are families exposed?

u How are families exposed?

u How can exposures be prevented?

u How can exposures be prevented?


u What additional information is available from u What additional information is available from NIOSH?

NIOSH?

1 What are Reproductive Hazards for Female Workers?

Substances or agents that affect the reproductive health of women or men or the ability of couples to have healthy children are called reproductive hazards.

Radiation, some chemicals, certain drugs (legal and illegal), cigarettes, some viruses, and alcohol are exam- ples of reproductive haz- ards.
This pamphlet focuses on reproductive hazards in the workplace that affect women and their ability to have healthy children.

For in- formation about a pam- phlet describing male reproductive hazards, see page 18.

The harmful effects of a few agents found in the workplace have been known for many years.

For ex- ample, more than 100 years ago, lead was discovered to cause miscarriages, stillbirths, and infertility in 2 female pottery workers.
Rubella (German measles) was recognized as a major cause of birth defects in the 1940s.

However, the causes of most reproductive health problems are still not known.

Many of these problemsinfertility, miscarriage, low birth weightare fairly common occurrences and affect working and nonworking women.

A reproductive hazard could cause one or more health effects, depending on when the woman is ex- posed.
For example, exposure to harmful substances during the first 3 months of pregnancy might cause a birth defect or a miscarriage.

During the last 6 months of pregnancy, exposure to reproductive hazards could slow the growth of the fetus, affect the development of its brain, or cause premature labor.

Reproductive hazards may not affect every worker or every preg- nancy.

Table 1 lists chemical and physical reproductive haz- ards for women in the workplace.
The list is not com- plete and is constantly being revised.

Therefore, do not assume that a substance is safe if it is missing from the list.

Table 2 lists viruses and other disease-causing (infec- tious) agents that are found in some workplaces and that have harmful reproductive effects in pregnant women.

3 Table 1.
Chemical and physical agents that are reproductive hazards for women in the workplace Agent Observed effects Potentially exposed workers Cancer treatment drugs (e.g., methotrexate) Infertility, miscarriage, birth defects, low birth weight Health care workers, pharmacists Certain ethylene glycol Miscarriages ethers such as 2-ethoxyethanol (2EE) and 2-methoxyethanol (2ME) Electronic and semi- conductor workers Carbon disulfide (CS2) Menstrual cycle Viscose rayon workers Lead changes Infertility, miscarriage, low birth weight, developmental disorders Ionizing radiation (e.g., X-rays and gamma rays) Infertility, miscarriage, birth defects, low birth weight, develop- mental disorders, childhood cancers Battery makers, solderers, welders, radiator repairers, bridge repainters, firing range workers, home remodelers Health care workers, dental personnel, atomic workers Strenuous physical labor (e.g., pro- longed standing, heavy lifting) Miscarriage late in Many types of workers pregnancy, prema- ture delivery 4 Table 2.
Disease-causing agents that are reproductive hazards for women in the workplace Agent Observed effects Potentially exposed workers Preventive measures Cytomegalo- virus (CMV) Birth defects, low birth weight, developmental disorders Hepatitis B Low birth weight virus Human Low birth weight, immuno- deficiency virus (HIV) childhood cancer Health care Good hygienic workers, work- ers in contact with infants and children practices such as handwash- ing Health care workers Health care workers Vaccination Practice univer- sal precautions Human Miscarriage Health care Good hygienic parvovirus B19 workers, work- ers in contact with infants and children practices such as handwash- ing Rubella Birth defects, Health care Vaccination be- (German measles) low birth weight Miscarriage, birth defects, developmental disorders Birth defects, low birth weight Toxoplas- mosis Varicella- zoster virus (chicken pox) workers, work- ers in contact with infants and children Animal care workers, veterinarians fore pregnancy if no prior immunity Good hygiene practices such as handwash- ing Health care Vaccination be- workers, work- ers in contact with infants and children fore pregnancy if no prior immunity 5 Workers with immunity through vaccinations or ear- lier exposures are not generally at risk from diseases such as hepatitis B, human parvovirus B19, German measles, or chicken pox.
But pregnant workers with- out prior immunity should avoid contact with in- fected children or adults.

Workers should also use good hygienic practices such as frequent handwashing to prevent the spread of infectious diseases among workers in elementary schools, nursery schools, and daycare centers.

In ad- dition, they should use universal precautionssuch as glove wearing and safe disposal of needlesto protect against disease-causing agents found in blood.
How Does the Female Reproductive System Work?

To understand how reproductive hazards can affect a womans reproductive health and her ability to have healthy children, it is helpful to understand how the female reproductive system works.

The main reproductive tissues in women are the ova- ries, uterus, and fallopian tubes.

The functions of these tissues are largely controlled by hormones 6 Brain Pituitary gland produced by the brain and the pituitary gland.
Hor- mones are chemicals that are formed in the body and circulate in the blood.

These hormones regulate the menstrual cycle, pregnancy, and the production of breast milk.

Estrogen and progesteronethe sex hormonesare produced by the ovaries.

These hor- mones are responsible for sexual develop- ment and for prepar- ing the uterine wall to hold and nourish a fertilized egg every month.
These sex hormones also contribute to the basic health of the heart, bones, liver, and many other tis- sues.

Finally, during pregnancy the placenta produces a hormone (human chorionic gonado- tropin, or hCG) that signals the body to support the preg- nancy.

Fallopian tube Uterus Ovary A woman is born with all of the eggs that she will ever have.

Therefore, if her eggs are damaged or 7 destroyed, she will not be able to replace them.
At puberty, a woman begins to have menstrual cycles, which enable her to release an egg each month from one of her ovaries.

Each cycle begins with a few days of menstrual flow.

When each new cycle begins, a new egg starts to grow.

Af- ter 2 to 3 weeks, a mature egg (ovum) is released from the ovary into the fallo- pian tubes, where it might be fertilized by one of the many sperm that may sur- round it.
If the egg is not fertilized, it will die and leave the body about 2 weeks later in the womans menstrual flow.

Then the process begins again with a new men- strual cycle.

If the egg is fertilized, the complex process of repro- duction continues.

The fertilized egg travels for about a week down the fallopian tube to reach the uterus, where it attaches to the wall.

A specialized tissue called the placenta forms between the uterus and the newly developing fetus.
The placenta transfers oxy- gen and nutrients from the mother to the fetus.

Dur- ing the first 3 months of pregnancy (first trimester), 8 the major fetal organs are formed.

During the remain- der of the pregnancy, these organs mature and the fe- tus grows rapidly.

Fallopian tube Ovary Fetus Placenta Uterus What Reproductive Hazards Might Be Caused by Workplace Exposures?

Only a few substances (some viruses, chemicals, and drugs) are known to cause reproductive health prob- lems.
Scientists are just beginning to discover how workplace exposures might cause reproductive prob- lems.

The following problems may be caused by workplace exposures: u Menstrual cycle effects u Infertility and subfertility u Miscarriage and stillbirths 9 u Birth defects u Low birth weight and premature birth u Developmental disorders u Childhood cancer Each problem is discussed in more detail in the fol- lowing sections.
Menstrual Cycle Effects High levels of physical or emotional stress or expo- sure to chemicals such as carbon disulfide may dis- rupt the balance between the brain, pituitary, and ovaries.

This disruption can result in an imbalance of estrogen and progesterone, and lead to changes in menstrual cycle length and regularity and ovulation.

Because these sex hormones have effects throughout a womans body, severe or long-lasting hormone im- balances may affect a womans overall health.
Infertility and Subfertility About 10% to 15% of all couples are unable to con- ceive a child after 1 year of trying to become preg- nant.

Many factors can affect fertility, and these factors can affect one or both partners.

Damage to the womans eggs or the mans sperm, or a change in the hormones needed to regulate the normal menstrual cycle are just a few things that can cause problems with fertility.
10 Miscarriage and Stillbirths About 1 in every 6 pregnancies ends in a miscar- riagethe unplanned termination of a pregnancy.

Miscarriages can occur very early in pregnancy, even before the woman knows she is pregnant.

Miscar- riages and stillbirths occur for many reasons, such as the following: u The egg or sperm may be damaged so that the egg cannot be fertilized or cannot survive after fertili- zation.

u A problem may exist in the hormone system needed to maintain the pregnancy.
u The fetus may not have developed normally.

u Physical problems may exist with the uterus or cervix.

What causes most of these problems is still unknown.

Birth Defects A birth defect is a physical abnormality present at birth, though it may not be detected until later.

About 2% to 3% of babies are born with a major birth de- fect.

In most cases, the cause of the birth defect is un- known.
The first 3 months of the pregnancy is a very sensitive time of development because the internal organs and limbs are formed during this period.

11 Many women are not aware that they are pregnant during much of this critical period.

Low Birth Weight and Premature Birth About 7% of babies born in the United States are born underweight or prematurely.

Poor maternal nu- trition, smoking, and alcohol use during pregnancy are believed to be responsible for most of these cases.
Although better medical care has helped many under- weight or premature babies to develop and grow normally, they are more likely than other babies to become ill or even die during their first year of life.

Developmental Disorders Sometimes the brain of the fetus does not develop normally, which leads to developmental delays or learning disabilities later in life.

About 10% of chil- dren in the United States have some form of develop- mental disability.

Such problems are often not noticeable at birth.


They can be difficult to measure, may be temporary or permanent, and range from mild to severe.

Developmental problems may appear as hyperactivity, short attention span, reduced learn- ing ability, or (in severe cases) mental retardation.

Childhood Cancer Ionizing radiation has caused cancer in some children whose mothers were exposed during pregnancy.
The 12 current practice of minimizing the use of X-rays on pregnant women, the use of newer equipment that re- duces the risk of exposure, and the use of protective shields have all helped to decrease the likelihood of harmful radiation exposure to fetuses.

How Are Workers and Their Babies Exposed?

Harmful substances can enter a womans body through u breathing in (inhalation), u contact with the skin, u or swallowing (ingestion).
Pregnant workers and those planning to become preg- nant should be especially concerned about exposure to reproductive hazards.

Some chemicals (such as al- cohol) can circulate in the mothers blood, pass through the placenta, and reach the developing fetus.

Other hazardous agents can affect the overall health of the woman and reduce the delivery of nutrients to the fetus.

Radiation can pass directly through the mothers body to harm her eggs or the fetus.
Some drugs and chemicals can also pass through a mothers 13 body into the nursing baby through the breast milk.

However, breast feeding has many positive effects.

Thus a woman who may be exposed to reproductive hazards on the job should consult with her doctor or other health care provider before deciding whether or not to breast feed.

Reproductive hazards do not affect every woman or every pregnancy.
Whether a woman or her baby is harmed depends on how much of the hazard they are exposed to, when they are exposed, how long they are exposed, and how they are exposed.

Viruses drugs chemicals alcohol Harmfulagentsin mothersblood Radiation Reduced health of mother 14 How Are Families Exposed?

Workplace substances that affect female workers and their pregnancies can also harm their families.
Without knowing it, workers can bring home harmful substances that can affect the health of other family membersboth adults and children.

For example, lead brought home from the workplace on a workers skin, hair, clothes, shoes, tool box, or car can cause lead poisoning in family members, espe- cially young children.

How Can Exposures Be Prevented?

Employers are responsible for training and protecting their workers.
Employees are responsible for learning 15 about the hazards in their workplace, using personal protective equipment, and following proper work practices.

Since little is known about reproductive hazards in the workplace, workers should also take the following steps to ensure their own safety: u Store chemicals in sealed containers when they are not in use.

u Wash hands after contact with hazardous substances and before eating, drinking, or smoking.

u Avoid skin contact with chemicals.


u If chemicals contact the skin, follow the di- rections for washing in the material safety data sheet (MSDS).

Employers are required to have copies of MSDSs for all hazardous materials used in their workplaces and to provide them to workers upon request.

u Review all MSDSs to become familiar with any reproductive hazards used in your workplace.

If you are concerned about reproductive hazards in the workplace, consult your doctor or health care provider.
16 u Participate in all safety and health education, train- ing, and monitoring programs offered by your employer.

u Learn about proper work practices and engineer- ing controls (such as improved ventilation).

u Use personal protective equipment (gloves, respi- rators, and personal protective clothing) to reduce exposures to workplace hazards.

u Follow your employers safety and health work practices and procedures to prevent exposures to reproductive hazards.
u Prevent home contamination with the following steps: Change out of contaminated clothing and wash with soap and water before going home.

 Store street clothes in a separate area of the workplace to prevent contamination.

 Wash work clothing separately from other laundry (at work if possible).

 Avoid bringing contaminated clothing or other objects home.

If work clothes must be brought home, transport them in a sealed plastic bag.
17 What Additional Information is Available from NIOSH?

NIOSH has published the following documents that contain information about reproductive hazards in the workplace: National Occupational Research Agenda DHHS (NIOSH) Publication No.

96115 Reproductive issues are an important part of the National Occupational Research Agenda that is be- ing coordinated by NIOSH.
The Agenda is expected to help focus attention on reproductive issues and to increase the amount of research conducted in this critical area.

This document discusses fertility and pregnancy abnormalities as one of 21 priority re- search areas.

The Effects of Workplace Hazards on Male Reproductive HealthDHHS (NIOSH) Publication No.

96132 This document provides general information about reproductive hazards for men in the workplace.
The text explains how substances in the workplace can cause reproductive problems and suggests methods for preventing exposures.
18 Notes 19 Notes 20 IOSH Delivering on the Nation''s promise: Safety and health at work for all people through research and prevention To receive other information about occupational safety and health problems, call 1–800–35–NIOSH (1–800–356–4674) or visit the NIOSH Homepage on the World Wide Web at http://www.cdc.gov/niosh , A N S ERVIC A N S ERVIC E E S S M M H U H U & & H H T T L L A A E E H H F F O O T T N N E E M M T T R R DEPA DEPA U U S S A A U.S. DEPARTMENT OF HEALTH AND HUMAN SERVICES Public Health Service Public Health Service Centers for Disease Control and Prevention Centers for Disease Control and Prevention National Institute for Occupational Safety and Health CDC CENTERS FOR DISEASE CONTROL CENTERS FOR DISEASE CONTROL AND PREVENTION AND PREVENTION DHHS (NIOSH) Publication No.
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