Baseline audiogram

Streptomycin Adults See footnote8 Children 20-40 mg/kg per day Ototoxicity, neurotoxicity, nephrotoxicity Baseline audiogram, vestibular testing, Romber testing and SCr Monthly assessments of renal function and auditory or vestibular symptoms... 

As defined in the Occupational Safety and Health Administration (OSHA) standard 29 CFR 1910.95 (g) (10) (i), a change in an individual s hearing threshold, relative to the baseline audiogram for that individual, of an average of 10 decibels (dB) or more at 2000, 3000, and 4000 hertz (Hz) in one or both ears. 

Baseline audiogram The audiogram against which future audiograms are compared. 

Q. When the baseline audiogram has to be revised due to persistent STS or improved thresholds, must the revisions be made for each ear separately ... 

A baseline audiogram shall be established on employees exposed at or above the action level within 6 months of the first exposure. Employees shall be notified of the requirement that testing shall be preceded by at least 14 hours without exposure to workplace noise. Hearing protectors may be worn as a substitute to this requirement. 

An annual audiogram shall be obtained on employees at or above the 8-hour TWA of 85 dB and compared annually with the baseline audiogram. If a threshold shift has occurred, the audiogram will be evaluated and the employee informed in writing. 

New recordability rules also redefined a recordable hearing loss from the previous definition of an average 25 dB change in hearing at 2000,3000 and 4000 Hz as compared to the baseline audiogram to the current definition outlined above. 

Has the employee suffered e STS (an average lOdB or more loss relative to the most current baseline audiogram averaged at 2000,3000 and 4000 Hz) in one or both ears according to the provisions of the OSHA noise standard ( 1910.95) ... 

Note In all cases, use the most current baseline to determine recordability as you would to calculate an STS under the hearing conservation provisions of the noise standard ( 1910.95). If an STS occurs in only one ear, you may only revise the baseline audiogram for that ear. 

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