The Council for Accreditation in Occupational Hearing Conservation: a good model for training allied health personnel.

Candidates with the following medical conditions shall not be certified as meeting the medical requirements of this standard: (1) Chronic vertigo or impaired balance as demonstrated by the inability to tandem gait walk. (2) On audiometric testing, average hearing loss in the unaided better ear greater than 40 decibels (dB) at 500 Hz, 1000 Hz, and 2000 Hz when the audiometric device is calibrated to ANSI Z24.5. (3) Any ear condition (or hearing impairment) that results in a person not being able to safely perform essential job tasks. NFPA Standard 1582 (pp. 11)