What is Electroencephalogram (EEG)
Electroencephalogram is a test that records electrical activity in the brain. It is often used to diagnose or monitor problems that are related to the brain, such as:
- Seizure disorders.
- Sleeping problems.
- Changes in behavior.
Tell a health care provider about:
- Any allergies you have.
- All medicines you are taking, including vitamins, herbs, eye drops, creams, and over-the-counter medicines.
- Any problems you or family members have had with anesthetic medicines.
- Any blood disorders you have.
- Any surgeries you have had.
- Any medical conditions you may have, including psychiatric conditions.
- Any history of illegal drug use or alcohol abuse.
What are the risks?
Generally, this is a safe test. If you have a seizure disorder, you may be made to have a seizure during the test. This is done so that your brain activity can be recorded during the seizure.
What happens before the procedure?
- Arrive with your hair clean and dry. Do not tease your hair, and do not put hair spray or oil in your hair.
- Do not have any caffeine during the 4 hours before your test.
- Follow instructions from your health care provider about sleeping, eating, or taking medicines before the test.
What happens during the procedure?
You will be asked to sit in a chair or lie down. Small metal discs (electrodes) will be attached to your head with an adhesive. These electrodes will pick up on the signals in your brain, and a machine will record the signals. During the test you may be asked to:
- Sit or lie quietly and relax.
- Open and close your eyes.
- Breathe deeply for three minutes.
- Look at a flashing light for a short period of time.
- Go to sleep.
When the test is complete, the electrodes will be removed by using a solution such as acetone or fingernail polish remover.
What happens after the procedure?
It is your responsibility to get your test results. Ask the lab or department performing the test when and how you will get your results.
