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Hearing

Last Updated: September 27, 2018

AAO-HNS Hearing Classification
Categorization scale to report results of hearing preservation surgery
Class Description Pure tone threshold (dB) Speech discrimination
A Useful 0 – 30 70 – 100%
B Useful > 30 and ≤ 50 ≥ 50%
C Aidable > 50 ≥ 50%
D Nonfunctional Any Level < 50%
Gardner-Robertson Hearing Classification
Standardized categorization of hearing function
Class Description Pure Tone Average or Speech Reception Threshold (dB) Speech Discrimination
I Good 0 – 30 70 – 100%
II Serviceable 31 – 50 50 – 69%
III Non-serviceable 51 – 90 5 – 49%
IV Poor 91 – max loss 1 – 4%
V None Not testa...