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What is a four frequency average hearing loss?

In order to be eligible for the Better Start funding for hearing loss, a child must have a permanent hearing loss in both ears, with a four frequency average hearing level of 40dB HL or greater in the better ear, or Auditory Neuropathy Spectrum Disorder. The permanent hearing loss can be conductive or sensorineural.

The four frequency average hearing loss (4FAHL) is the average of thresholds at 500, 1000, 2000 and 4000Hz.

For example: If a child has the audiogram below:-
audiogram
The four frequency average hearing loss can be calculated as follows:-
 

  500Hz 1000Hz 2000Hz 4000Hz 4FAHL
Left ear 30 40 50 60 (30+40+50+60)/4
= 180/4
= 45
Right ear 40 45 55 65 (40+45+55+65)/4
= 205/4
= 51.25


The four frequency average hearing loss in the better ear is 45dB HL. This child would be eligible for Better Start funding.

09-Nov-2015 9:21 AM (AEST)