Hearing Screening Training Manual - Minnesota Department of Health

BIOLOGIC CALIBRATION CHECK
(Optional if Threshold Audiometry is not performed)
To insure that the audiometer is in calibration, the person with primary responsibility for the
hearing screening program should do biologic calibration checks. These calibration checks
should be done each day prior to use or anytime during use when there is reason to suspect the
audiometer may not be working properly. Use the “Same Ear HL” procedure described below.
(Form on next page.)
Same Ear HL Procedure:
1. Obtain a threshold (500–8000 Hz) on the better ear with right (red) earphone and record
the results.
2. Obtain a threshold (500–8000 Hz) on the same ear with the left (blue) earphone and
record the results.
3. Check the thresholds at each frequency to see that they differ by no more that ±5 dB. If
they do vary more than this, the audiometer should not be used and the audiometer should
be checked.
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