EEG (Electroencephalography)

The Electroencephalogram (EEG) examination is a test that gives important information about the health and function of the brain. This test evaluates epilepsy, episodes of alteration in consciousness, memory loss, confusion and other disorders.

Electrical impulses which are normally present in the brain are recorded through small metal discs called electrodes that are applied with an adhesive to the head. These impulses are amplified and recorded on a paper graph or a computer disc. You will be asked to lay still with your eyes closed during the recording. You may be asked to breathe deeply for a few minutes. A flashing light may be placed in front of your closed eyes. After the test, the electrodes will be removed and you may resume your normal activity.

The test can be done in about 60-90 minutes for a routine study. Studies that are more detailed can be done with simultaneous video recording during daytime hours or for 24 hours. Ambulatory EEG monitoring is also available.

To prepare for the test:

CLEAN your hair thoroughly, without any hairspray, gel, mousse, oil, etc. Hair must be DRY for the test.
For accurate test results, please wear hair down, no hair extensions, braids, ponytails, buns, etc.
NO CAFFEINE the day of the test including coffee, tea, cola, chocolate, etc.
You may eat prior to the EEG unless you have fasting lab work or other tests ordered that prevent you from eating.
You may take your medications as usual unless otherwise instructed.
For a routine or regular EEG, allow 60 minutes.
For adults having a Sleep EEG, limit your sleep to FOUR HOURS or less the night before. Allow 90 minutes for the test.
For adults having a Two-Hour Sleep EEG, REMAIN AWAKE from MIDNIGHT on. Allow two and a half hours for the test.