A standard threshold shift (STS) is defined as a change in hearing thresholds of what degree at specified frequencies?

A standard threshold shift (STS) is defined as a change in hearing thresholds of 10 dB or more at specified frequencies, which includes 2000, 3000, and 4000 Hz. This definition is crucial for tracking the onset of hearing loss, particularly in occupational health settings, where employees might be exposed to loud noises that can affect their auditory health over time.

The frequencies specified are significant because they are commonly affected by noise exposure. Monitoring shifts at these frequencies allows audiologists to assess the risk of hearing loss and implement necessary preventive measures. Recognizing an STS at these particular frequencies serves as an important health indicator, ensuring timely intervention and management of potential hearing impairment.