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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.
Special considerations
Review Date: 4/30/2007
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. Copyright ©2003 A.D.A.M., Inc., as modified by University of California San Francisco. Any duplication or distribution of the information contained herein is strictly prohibited.
Information developed by A.D.A.M., Inc. regarding tests and test results may not directly correspond with information provided by UCSF Medical Center. Please discuss with your doctor any questions or concerns you may have.
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