standard threshold shift


Also found in: Acronyms.

standard threshold shift

A change in hearing threshold, relative to the baseline audiogram for a particular employee, of an average of 10 decibels (dB) or more at 2000, 3000, and 4000 hertz (Hz) in one or both ears.
References in periodicals archive ?
If an employee has a work-related standard threshold shift, they must be refitted and retrained in the use of hearing protection devices.
Frequency (%) of the use of occupational hearing protection devices in the experimental and control subjects Half the Almost Never Seldom time always Always Experimental 27.3 12.2 2.8 11.7 46.0 Control 47.8 16.9 2.7 5.7 26.9 Standard threshold shift (STS), the number of completed audiograms (A), and the total number of subjects who had at least two completed audiograms in the experimental and control groups STS [*] A Subjects R L B T n (%) n (%) Experimental 1 7 12 20 1,022 (1.96) 250 (8.0) Control 1 2 4 7 811 (0.86) 216 (3.2) (*.)R = right ear; L = left ear; B = bilateral; T = total.
Therefore, a need for initial site evaluations and for baseline hearing assessments has been established, as well as the need for annual audiograms to evaluate for standard threshold shift.
OSHA also clarified two matters relating to recording occupational hearing loss for general industry in conjunction with the final rule: computation of a standard threshold shift for determining recordable hearing loss and how OSHA will treat an expected increase in the number of recorded cases resulting from new recordkeeping.
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