Thursday, November 27, 2008
Alternative Names :
Evoked auditory potentials; BAEP - brainstem auditory evoked potentials; Evoked response audiometry
The brainstem auditory evoked response (BAER) test measures brain wave activity that occurs in response to clicks or certain tones.
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 Results :
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:
Central pontine myelinolysis
There are no risks.