Document ID: chunk:federal_register_of_legislation:F2023C00151:reg:4000:p1
Version: federal_register_of_legislation:F2023C00151
Segment Type: reg
Provision Reference: reg 4000 (pt 1/8)
Character Range: 271278–275009

4000

APHL =

The figures to be entered in the columns headed "Right" and "Left" will be obtained from the audiogram.

The figures to be entered in the column headed "Loss (%)" are to be obtained by applying Tables 7.1.3 to 7.1.8. (A different scale is used for each row of the calculation.)

The figures in the column headed "Loss (%)" are then to be added up to give the APHL.

The Accepted Percentage Hearing Loss for different types of deafness can be calculated by using air conduction, bone conduction, various combinations of the two or a special formula. The relevant rules are summarised in Table 7.1.2 and in the text which follows it. (The "types" mentioned in Table 7.1.2 refer to the combination of hearing losses as described in the preceding text and not necessarily to named accepted conditions.)

Table 7.1.2 sets out which HTLs (air or bone) from the audiogram are to used in calculating APHL.

Procedural Table 7.1.2
TYPES OF AUDIOGRAM TO BE USED
                               For Right                                                        For Left
                               HTL use:                                                         HTL use:
Type 1                         Bilateral mixed deafness                                         Air             Air
Type 2                         Right mixed deafness                                             Air             0 (zeros)
Type 3                         Left mixed deafness                                              0 (zeros)       Air
Type 4                         Bilateral sensorineural deafness                                 Bone            Bone
Type 5                         Bilateral sensorineural deafness with right conductive deafness  Air             Bone
Type 6                         Bilateral sensorineural deafness with left conductive deafness   Bone            Air
Type 7                         Bilateral conductive deafness                                    See Substep 3A
Type 8                         Bilateral conductive deafness with right sensorineural deafness  Air             Air
Type 9                         Bilateral conductive deafness with left sensorineural deafness   Air             Air
Type 10                        Left conductive deafness with right sensorineural deafness       Bone            Air
Type 11                        Right conductive deafness with left sensorineural deafness       Air             Bone
Type 12                        Right conductive deafness                                        See Substep 3A
Type 13                        Right sensorineural deafness                                     Bone            0 (zeros)
Type 14                        Left sensorineural deafness                                      0 (zeros)       Bone
Type 15                        Left conductive deafness                                         See Substep 3A

Information and instructions concerning the use of bone HTLs are to be found on the next page, and apply in all cases where "Bone" appears in this table or in which reference is made to Substep 3A.

No age adjustment permitted for this table

Information and instructions concerning the use of bone HTLs

1. Whenever the use of bone conduction HTL values is specified but if it is not practicable or appropriate to obtain bone conduction HTL values as a result of any of the reasons described on page 108, air conduction HTL values may be used instead.

2. Threshold of Reliability.

Bone conduction HTLs in excess of 60 deciBels are generally unreliable. At the 500 Hz frequency, bone conduction HTLs in excess of 45 deciBels are unreliable.

Thus a set of thresholds of reliability for bone HTLs is