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BAER - brainstem auditory evoked response

Definition

The brainstem auditory evoked response (BAER) test measures brain wave activity that occurs in response to clicks or certain tones.

Alternative Names

Evoked auditory potentials; BAEP - brainstem auditory evoked potentials; Evoked response audiometry

How the test is performed

You lie on a reclining chair or bed and remain still. Electrodes are placed on your scalp and on each earlobe. The earphones give off a brief click or tone. The electrodes pick up the brain's responses to these sounds and record them.

How to prepare for the test

You may be asked to wash your hair the night before the test.

How the test will feel

There is little discomfort.

Why the test is performed

The test is performed to help diagnose nervous system abnormalities and hearing losses (especially in low birth weight newborns), and to assess neurological functions.

Normal Values

The auditory brain stem values are in a normal range. This range varies among patients and instruments used.

What abnormal results mean

Abnormal findings may indicate a hearing loss, multiple sclerosis, or stroke.

Additional conditions under which the test may be performed:

• Acoustic neuroma
• Central pontine myelinolysis

What the risks are

There are no risks.

Review Date:4/30/2007
Reviewed By:Joseph V. Campellone, M.D., Division of Neurology, Cooper University Hospital, Camden, NJ. Review provided by VeriMed Healthcare Network.

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