Audio Metric (Hearing) Testing Cont.

  1. Each employee's annual audiogram will be compared to his/her baseline audiogram by qualified evaluator to determine if a Standard Threshold Shift (STS) has occurred.

  2. A Standard Threshold Shift is defined by OSHA as a change in hearing threshold relative to the baseline of an average of 10dB or more at 2000, 3000, 4000 Hz either ear.

  3. In determining if a Standard Threshold Shift has occurred, an allowance can be made for the contribution of aging (presbycusis). The age correction values to be used are found in Appendix F of 1910.95.

  4. If an annual audiogram indicates that an employee has incurred a Standard Threshold Shift, the person will be scheduled for a retest within 30 days to determine if the threshold shift is persistent.

  5. The following procedures will be taken if a comparison of the baseline audiogram indicates a persistent standard threshold shift:
    1. Employees not using hearing protectors will be trained, fitted, and required to use hearing protectors if they are exposed to an 8 hour TWA average sound level of 85 decibels or greater.

    2. Employees already using hearing protectors will be retrained, refitted, and required to use hearing protectors.

    3. The (Position designated) will inform the employee, in writing, within 21 days of this determination, of the existence of a permanent Standard Threshold Shift (See Form #2). A copy of the STS letter will also be sent to the employee's supervisor.

    4. The (Position designated) will counsel the employee on the importance of using hearing protectors and refer the employee for further clinical evaluation if necessary.
  6. Persistent significant threshold shifts must be entered on the OSHA 200 Log (From 200) if determined to be work related.

  7. If a subsequent audiometric testing of an employee whose exposure to noise is less than an 8-hour TWA of 90 decibels indicates that a Standard Threshold Shift is not persistent, the (Position designated):
    1. Shall inform the employee of the new audiometric interpretation.

    2. Discontinue the required use of hearing protectors for that employee.

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