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EEG (Electroencephalogram)
#MedicalTestDetail#Electroencephalogram EEG#Epilepsy Test Electroencephalogram EEG

What Is an EEG (Electroencephalogram)Test?

Before During After
An EEG, or electroencephalogram, is a test that records the electrical signals of the brain. Doctors use it to help diagnose epilepsy and sleep disorders.

Before
Let your doctor know about any medications both prescription and over-the-counter and supplements you're taking.

Wash your hair the night before the test. Don't use any leave-in conditioning or styling products afterward.

During
You lie down on the exam table or bed, and a technician puts about 20 small sensors on your scalp. These sensors, called electrodes, pick up activity from cells inside your brain called neurons and send them to a machine, where they show up as a series of lines recorded on moving paper or displayed on a computer screen.

You'll relax with your eyes open first, then with them closed. The technician may ask you to breathe deeply and rapidly or to stare at a flashing light, because both of these can change your brain wave patterns.

It's rare to have a seizure during the test.

You can have an EEG at night while you're asleep. If other body functions, such as your breathing and pulse, are also being recorded, the test is called polysomnography.

After
The technician will take the electrodes off and wash off the glue that held them in place. You can use a little fingernail polish remover at home to get rid of any leftover stickiness.

Unless you're actively having seizures or your doctor says you shouldn't, you can drive home. But if the EEG was done overnight, it's better to have someone else drive you.


You can usually start taking medications you'd stopped specifically for the test.

A neurologist, a doctor who specializes in the brain, will look at the recording of your brain wave pattern. Things that don't look right may suggest a problem with your nervous system.

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