Average Hearing Level

Average hearing levels are calculated for each baseline audiogram and each annual audiogram. A “three frequency average” threshold level is computed, from (2000, 3000, and 4000 Hz) frequency ranges, for each ear and assigns the average hearing level code according to the following classifications:

Threshold Average
(db HL)
Average
Hearing
Level
Comments
0 - 25   Hearing is within normal limits.
26 - 40 MI - Mild Some difficulty with faint or distant speech.
41 - 55 MO - Moderate May not understand conversational speech if speaker is more than five feet away.
56 - 70 MS - Moderately Severe May understand loud conversation only.  Group or classroom discussions are impossible to follow.  Most consonants are not heard.
71 - 90 SE - Severe Can hear a loud voice from one foot away and may identify some environmental sounds.  Consonants are not heard.
Above 90 PR - Profound May hear only a few very loud environmental sounds.  May "feel" very loud, low frequency sounds.

The comments for each average hearing level are general in nature.  Pure tone threshold alone is not sufficient to accurately measure the degree of handicap caused by a hearing impairment.


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