Document ID: chunk:federal_register_of_legislation:F2016L01332:reg:3d:p6
Version: federal_register_of_legislation:F2016L01332
Segment Type: reg
Provision Reference: reg 3D (pt 6/13)
Character Range: 236653–240594

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 be 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 132, 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 defined as follows:

       for   500 Hz       45 deciBels for 1000 Hz       60 deciBels for 1500 Hz       60 deciBels for 2000 Hz       60 deciBels for 3000 Hz       60 deciBels for 4000 Hz        60 deciBels

    Figures in excess of the threshold of reliability for bone conduction are not used in calculating the impairment due to hearing loss.

    For sensorineural hearing loss, whenever the bone conduction HTL exceeds the threshold of reliability, the air conduction HTL for