Electroencephalogram (EEG)

What is an EEG?

An EEG is a printed representation of the electrical activity of the brain. Similar to the EKG in technique, the EEG involves placing electrodes on the patient's scalp. Gel is placed under each electrode to help conduct the brain's electrical signal back to the machine. Because the electrodes are very sensitive to movement and are easily displaced, you will be asked to be as still as possible during the exam. To help you relax, the lights will be out during the exam and you will be encouraged to sleep if you can.

If the patient is a small child, your physician may prescribe medication to make him/her sleep. This is necessary to ensure a quality test and keep the electrodes in place. Small children may have a parent in the room with them.

This test is painless but requires about 1-1 ½ hours including the hook-up. There will be some gel in your hair after the exam. If you have to return to work or school after the exam you can want to allow yourself a little extra time to clean up.

The test is usually interpreted the next day.

Why does my doctor want me to have an EEG?

Symptoms such as seizures, loss of consciousness, and confusion can often be traced to disorders of the brain. Your physician may want an EEG to diagnose the disorder or to eliminate the brain as the primary source of the problem.

What do I need to do before I come in for my test?

1. Make sure you have you physician's order. You cannot be admitted for the test without an order. Present
your orders to the admission clerk and she will give you additional paperwork to bring to our department.
2. Make sure your hair is clean and free of gel, mousse, or hair spray.
3. No caffeine (soda, chocolate, etc.) after midnight
4. Take your prescribed medications unless otherwise instructed.