Audiogram
A hearing test that measures the softest sounds a person can hear at various frequencies, used in OSHA hearing conservation programs.
Key Facts
- Baseline established within 6 months of first noise exposure
- Annual monitoring required for workers exposed to ≥85 dBA TWA
- Tests frequencies from 500 Hz to 8,000 Hz
- Standard Threshold Shift triggers employer notification within 21 days
An audiogram tests hearing thresholds at frequencies of 500, 1000, 2000, 3000, 4000, and 6000 Hz for each ear. OSHA requires a baseline audiogram within 6 months of an employee's first exposure at or above the action level (85 dBA TWA), followed by annual audiograms. A Standard Threshold Shift (STS) — a change of 10 dB or more averaged at 2000, 3000, and 4000 Hz in either ear — triggers employer action including notification, hearing protection refitting, and possible medical referral.
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