GSI 18
Pretest noise recovery period
NOTE: The GSI 18 is a versatile audiometer designed for use in physician offices,
schools, industrial settings, the military, etc. The generic term “subject” used in this
manual is used to identify the person whose hearing is being evaluated.
Two prerequisites are of particular importance to the procurement of reliable
audiograms:
• Prior to testing, allow enough time for the subject to recover from the effects of noise
exposure
. Exposure to high levels of sound (unmuffled lawn mowers, power tools, loud
music, gunfire, etc.) tends to create a temporary threshold shift (TTS) which diminishes
with time after exposure. If a subject tested too soon after noise exposure, a hearing test
may indicate a h earing loss that does not reflect the subject’s true hearing. It is
recommended that the testing procedure prescribe some time interval - usually at least
16 hours – between the last exposure to high-level sound and the administration of any
hearing test.
• Tests should be performed in a quiet area.
Any program aimed at obtaining reliable records of hearing thresholds should
be staffed and supervised by appropriately-
trained individuals. Training
courses leading to certification are available for
audiometric technicians in
most urban areas.
2-2 1718-0100 Rev. E
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