baseline audiogram

baseline audiogram

A reference audiogram against which future audiograms are compared.

For workers occupationally exposed to loud sounds, a baseline audiogram must be provided within 6 months of an employee's first exposure at or above an 8-hour TWA of 85 dBA.
References in periodicals archive ?
Neither patient had had a previous audiogram available to confirm an objective change in hearing thresholds, but having a baseline audiogram on hand for comparison is rather rare.
The baseline audiogram serves as the reference point for all subsequent hearing tests and allows for changes in hearing sensitivity at a given frequency to be documented.
The Department of Defense uses the Occupational Safety and Health Administration's definition of an STS8: a change in hearing threshold relative to the baseline audiogram of an average of 10 dB or more at 2000 Hz, 3000 Hz, and 4000 Hz in either ear.
The patient's actual baseline audiogram (solid line) would be provided on the same graph with gray shading indicating the "speech banana.
Ototoxic threshold shift from the initial baseline audiogram was defined as: (1) [greater than or equal to] 20 decibel (dB) decrease at any one test frequency, (2) [greater than or equal to]10 dB decrease at any 2 adjacent frequencies, or (3) loss of response at 3 consecutive frequencies where responses had previously been obtained.
Hearing protection is also mandatory for employees who nave been exposed to 85 dB(A) noise levels if they did not have a baseline audiogram, and for workers who experience standard threshold shifts--an average shift from baseline hearing levels of 10 dB or more at the audiometric frequencies of 2,000, 3,000, and 4,000 Hz.
This includes Soldiers without a reference baseline audiogram or whose last periodic audiogram is greater than one-year old.
STS is defined by the Occupational Safety and Health Act (OSHA) as an average 10-dB or greater shift from the baseline audiogram at 2.
STS is defined by the Occupational Safety and Health Act (OSHA) as an average l0-dB or greater shift from the baseline audiogram at 2.