The OSHA 300 Log records work-related injuries and illnesses, including occupational hearing loss. A case is recordable when the employee has both an STS (10 dB or more average shift at 2,000, 3,000, and 4,000 Hz) and a total hearing level of 25 dB HL or more at those frequencies — both conditions in the same ear (29 CFR 1904.10(a)).
The OSHA 300 Log (Form 300) records all work-related injuries and illnesses, including hearing loss. A hearing loss case is recordable when two conditions are both met: the employee has experienced an STS (average 10 dB or more at 2,000/3,000/4,000 Hz in the same ear), AND the employee’s total hearing level in that ear — averaged at the same frequencies — is 25 dB or more above audiometric zero (29 CFR 1904.10(a)). Both conditions must be present in the same ear. If the STS occurs in one ear but the hearing level threshold is met only in the other, the case is not recordable. Employers may use age correction when evaluating the STS component, but age correction cannot be applied when evaluating whether the 25 dB threshold is met. SHOEBOX: SHOEBOX PureTest automatically calculates STS at the time of testing, and the Data Management Portal flags audiograms that may meet recordability criteria — giving EHS managers early visibility into potential 300 Log entries before the 7-calendar-day recording deadline.
