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by Lukas R



Reasons for Test

An EEG may be done to:

What to Expect

Prior to Test

Depending on the reason for your EEG, you may be given some of the following instructions:

Description of Test

You will sit in a chair or lie on a bed. Electrodes will be placed on your scalp with special gel or paste. The electrodes will record the brain's electrical activity. You will be asked to close your eyes and be still for most of the test. Depending on the reason for the test, there may be other steps such as:
  • You may be asked to breathe deeply and rapidly.
  • A strobe light may be turned on. It sends fast pulses of light.
In some cases, a video recording of the test will be made.

After Test

The technician will remove the electrodes and you will be able to go home.
Talk to your doctor about restarting any medications that you may have stopped.

How Long Will It Take?

The test may take about one hour. In some cases, an EEG is done overnight or over a number of days. The test may be done at home or in the hospital.

Will It Hurt?

No, an EEG is painless.


Your test results will be reviewed. Your doctor will get a report within 1-2 weeks and will talk to you about the results.


Epilepsy Foundation

National Institute of Neurological Disorders and Stroke



Canadian Neurological Sciences Federation

Epilepsy Canada



EEG (electroencephalogram). KidsHealth website. Available at: Updated September 2013. Accessed February 13, 2014.

Seizure in adults. EBSCO DynaMed website. Available at: Updated February 7, 2014. Accessed February 13, 2014.

Seizure in children. EBSCO DynaMed website. Available at: Updated July 22, 2013. Accessed February 13, 2014.

Shevell M, Ashwal S, Donley D, et al. Practice parameter: Evaluation of the child with global developmental delay: Report of the Quality Standards Subcommittee of the American Academy of Neurology and The Practice Committee of the Child Neurology Society. Neurology. 2003;60:367-380.


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