Community Medicine (PSM) · Occupational Health and Legislation (ESI, Factories Act)

In noise-induced hearing loss, the typical audiometric finding is a notch at which frequency?

A 2000 Hz
B 3000 Hz
C 4000 Hz ✓
D 6000 Hz

Correct answer: C. 4000 Hz

Explanation

Noise-induced hearing loss characteristically shows a dip or notch at 4000 Hz on pure tone audiometry. This is due to the vulnerability of the basal turn of the cochlea to noise damage. The notch may later extend to other frequencies with continued exposure.

Reference: Park's Textbook of Preventive and Social Medicine, 26th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

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