Prevalence of clinical referrals having hearing thresholds within normal limits.

Objectives: To document the prevalence of clinically normal air conduction thresholds (0.5-4 kHz, bilaterally, ≤20 dB HL) among children and adults in a large audiology service and to estimate the prevalence of auditory processing disorder (APD).

Design: Over a period of one year, clinicians implemented their usual protocol and recorded a brief history for those with normal audiometry.