What defines a significant threshold shift (STS) in audiometric testing?

A significant threshold shift (STS) in audiometric testing is defined as an average change of plus or minus 10 dB at specific frequencies relative to a reference audiogram. This measurement is critical because it indicates a notable alteration in a person's hearing ability compared to past assessments.

When monitoring hearing, particularly in environments with potential noise exposure, identifying an STS is crucial for understanding whether an individual may be experiencing hearing loss. A change of 10 dB is significant enough to warrant further evaluation and possibly intervention to protect hearing health. The method of reference audiograms helps ensure that any observed change is compared to the individual's baseline hearing levels, allowing for accurate detection of shifts that may require action.

Other options may not reflect the established criteria for what constitutes a significant change in hearing ability within audiometric testing protocols, particularly in occupational health settings. Thus, the defined threshold of 10 dB establishes a clear and reliable parameter for identifying and responding to potential hearing loss.