---
title: What is a Standard Threshold Shift (STS)?
description: A Standard Threshold Shift, or STS, is defined in the occupational noise exposure standard at 29 CFR 1910.95(g)(10)(i) as a change in hearing threshold, relative to the baseline audiogram for that emp
---

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# What is a Standard Threshold Shift (STS)?

A **Standard Threshold Shift (STS)** is defined under OSHA’s occupational noise exposure standard as a **change in an employee’s hearing threshold of an average of 10 decibels (dB) or more at 2000, 3000, and 4000 Hertz (Hz) in either ear**, when compared to their baseline audiogram. https://www.osha.gov/laws-regs/regulations/standardnumber/1904/1904.10

**In simpler terms:** an STS is OSHA’s way of saying that a worker’s hearing has measurably worsened. Their latest hearing test shows at least a 10 dB loss at key speech frequencies compared to their baseline. When this happens, the employer is required to **evaluate hearing protection, retrain the employee, and complete any required follow-up actions.**

 

 

 

 

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