The Definition of Audiometric Testing

Definition of Audiometric Testing

Audiometric testing is a hearing evaluation used to measure a worker's hearing sensitivity across a range of frequencies, typically performed to establish a baseline hearing level upon hire or entry into a hearing conservation program, and then repeated periodically to detect any standard threshold shift indicating potential noise-induced hearing loss. In the U.S., audiometric testing is a required component of OSHA's Hearing Conservation Program (29 CFR 1910.95) for employees exposed to noise at or above specified action levels, and results are used to guide interventions such as improved hearing protection, engineering noise controls, or medical referral.

Example of Audiometric Testing

A manufacturing employee working near noisy stamping presses undergoes an annual audiometric test as part of the facility's hearing conservation program; when the results show a standard threshold shift compared to their baseline, the safety team investigates whether hearing protection is being used correctly and reviews noise levels at that workstation.

Frequently Asked Questions: Audiometric Testing

Who is required to participate in audiometric testing?

Under OSHA's Hearing Conservation Program requirements, employees exposed to an 8-hour time-weighted average noise level of 85 decibels or higher are generally required to participate in audiometric testing as part of a broader hearing conservation program.

What is a standard threshold shift?

A standard threshold shift is a significant change in hearing sensitivity, defined by OSHA as an average shift of 10 decibels or more at specific frequencies in either ear compared to the employee's baseline audiogram, which triggers required follow-up actions such as retesting, hearing protection evaluation, or referral for further evaluation.

How often should audiometric testing be conducted after the baseline test?

Following the initial baseline test, OSHA generally requires annual audiometric testing for employees enrolled in a hearing conservation program, allowing the organization to track any progressive changes in hearing over time and intervene before further hearing loss occurs.