You indicated that:

• The event or exposure resulted in the affected employee having a Standard Threshold Shift in hearing.

According to OSHA Regulations 29 CFR 1904.10(a), if an employee's hearing test (audiogram) reveals that the employee has experienced a work-related Standard Threshold Shift (STS) in hearing in one or both ears, and the employee's total hearing level is 25 decibels (dB) or more above audiometric zero (averaged at 2000, 3000, and 4000 Hz) in the same ear(s) as the STS, the event or exposure must be recorded.

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