Otometrics 21
4.3 ABR results
PASS
A PASS indicates that an auditory brainstem response to a 35 or 45 dB nHL broadband stimulus was
detected. This method mainly tests the frequencies from 2000 to 4000 Hz, which carry the most
important acoustic information for speech development. A PASS result ensures that a significant hear-
ing loss in these frequencies can be ruled out with 99.5% confidence.
REFER
A REFER may indicate a significant hearing loss.
A REFER may also be the result when too much electrical noise drowns out the response. Too much
electrical noise can result if the infant moves or is sucking during the test. Other electrical appliances
and fluorescent lighting in the vicinity can also cause electrical interference. A good indication of this
is if the probability curve on the display is near to the PASS criterion. If this is the case, try to improve
measurement conditions and repeat the test.
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