Evoked Potentials Test
What is an Evoked Potential Test?
Evoked potential tests measure electrical activity in certain areas of the brain in response to stimulation of certain groups of nerves. These tests are often used to assist in the diagnosis of multiple sclerosis because they can indicate problems along the pathways of certain nerves that are too subtle to be noticed or found on a doctor’s exam. Problems along the nerve pathways are a direct result of the disease. The demyelination causes the nerve impulses to be slowed, garbled, or halted altogether.
There are three main types of evoked potential tests:
- Visual Evoked Potentials (VEP): You sit in front of a screen on which an alternating checkerboard pattern is displayed.
- Brainstem Auditory Evoked Potentials (BAEP): You hear a series of clicks in each ear.
- Sensory Evoked Potentials (SEP): Short electrical impulses are administered to an arm or leg.
How Are the Evoked Potential Tests Performed?
- Evoked potential tests are recorded by placing wires with stimulators on the scalp over the areas of the brain.
How Long Do Evoked Potential Tests Take?
- It usually takes about two hours to do all three types of evoked potential tests.
- A neurologist or neurophysiologist with special training in these tests will interpret the results.
Is the Evoked Potential Test Safe?
- Evoked potential testing is harmless and painless.