The electroencephalogram (EEG) is a noninvasive test used to evaluate brain function or disorders or to confirm brain death.
An EEG may be done for the following reasons:
There are very few risks associated with this procedure. If you are prone to seizures and need to discontinue medication for the test, you may be more likely to have a seizure.
Depending on the reason for your EEG, you may be given some of the following instructions:
- Stop taking medications, such as antidepressants, stimulants, or seizure medicines, at least 1-2 days before the test.
- Avoid caffeine the day before and the day of the test.
- Shampoo hair and do not use hairspray or gel the day of the test.
- If you are having a sleep-deprived EEG, you may need to stay awake the night before the test. You should also arrange for a ride to and from the test.
- If you are prone to seizures, arrange for a ride to and from the test.
You sit or lie in a chair or cot. Electrodes are attached to your scalp with a special gel or paste. These electrodes record the brain's electrical activity and transmit impulses to an electroencephalograph, which magnifies them and records them as brain waves on moving strips of paper. You will be asked to close your eyes and be still for most of the test. However, depending on the reason for the test, you may also be asked to breathe deeply and rapidly for three minutes.
A strobe light may also used for a portion of the test.
The technician removes the electrodes. You will be advised about restarting any medications you may have stopped.
A standard EEG takes about one hour.
Your test results will be interpreted by a neurologist and forwarded to your doctor. Within one to two weeks of your test, your doctor will discuss the results with you.
- Change in your regular seizure pattern once restarting your anti-seizure medication
Last reviewed November 2007 by
J.L. Chang, MD, FAASM
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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