An average change in hearing threshold of 10 dB or more at 2,000, 3,000, and 4,000 Hz in either ear, measured relative to the baseline audiogram. The STS is the primary clinical and compliance threshold in occupational audiometry. An STS triggers: written employee notification within 21 days (29 CFR 1910.95(g)(8)(i)); HPD refitting and retraining; and, if the STS is work-related and the employee’s total hearing level at those frequencies is 25 dB or more above audiometric zero, recording on the OSHA 300 Log (29 CFR 1904.10(a)). (29 CFR 1910.95(g)(10)(i))
SHOEBOX: SHOEBOX PureTest automatically calculates STS against established baselines using OSHA and MSHA methodologies immediately upon test completion.
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