What is an EEG test?

– An EEG test, or an electroencephalogram test, is used to find problems related to electrical activity of the brain by tracking and recording brain wave patterns. It is a noninvasive and painless test involving small metal discs with thin wires, or electrodes, being placed on the scalp. The electrodes send signals to a computer, which records the results. The physician will then inform the patient of the test results, its meaning, and what to do next.

What is an EEG test used to diagnose?

– The test is used to help diagnose conditions such as:

• Seizures
• Epilepsy
• Head injuries
• Dizziness
• Headaches
• Brain tumors
• Sleeping problems
• Confirming brain death

What does an abnormal EEG mean?

– In general, an abnormal EEG could mean:

• Generalized seizures
• Brain waves that have an abnormal frequency, height, or shape
• Any brain wave that shows up in a way that it should not

– Other ways that abnormalities show up in an EEG are:

• Abnormal bleeding or hemorrhage
• An abnormal structure in the brain (brain tumor)
• Tissue death (due to a blockage in blood flow or cerebral infarction)
• Drug or alcohol abuse
• Head injury
• Migraines
• Seizure disorder (epilepsy)

– If you have an abnormal EEG, your doctor will explain the significance of the abnormality and walk you through the next steps in your treatment plan going forward.

How do I prepare for an EEG?

– Before the test, it is important that you do the following:

• Wash your hair the night before
• DO NOT put products in your hair on the day of the test (e.g., sprays, gels, etc.)
• Ask your doctor if you should stop taking any medications before the test

How long does it take to get an EEG?

– Typical procedures vary usually within the span of 30 minutes to 2 hours in its entirety. This is because electrode placement can take anywhere from 20 minutes to an hour.

– If you have an ambulatory EEG, brain activity is recorded for at least 24 hours.