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Electroencephalography (EEG)

​An Electroencephalography (EEG) is a test that tracks electrical activity in the brain. It is used to diagnose and evaluate seizures and epilepsy, and guides treatment and management.


How should I prepare for the test?

Before the day of test

  • Continue with your regular diet and medications unless instructed differently by your doctor.
  • Avoid smoking and drinking beverages with caffeine e.g. coffee, tea at least eight hours before the test.
  • If you have been informed by your doctor to go for a sleep-deprived EEG do not sleep for at least 16 hours before the test

On the day of test

  • Wash and dry your hair before your appointment.
  • Do not use hair styling products e.g. foam, cream, gel, oil.
  • Bring all medications and note down the name and dosage of the medication you are taking. Pass this information to the medical technologist before your test.
  • Have a proper meal before coming for your test.

How is the test performed?

The test is done by a medical technologist and takes about an hour.

  • This test is done while you are lying down.
  • Your scalp is cleaned using a gel.
  • Small markings are made on your scalp.
  • 27 electrodes are attached to the marked areas using a safe and washable paste.
  • The electrodes are connected to a machine to record your brain’s electrical activities. For accurate test results, close your eyes and remain still, unless otherwise instructed. You may be asked to open and close your eyes, look at flashing lights and breathe deeply and rapidly for several minutes during the test.
  • Once the test is done, the electrodes are removed, paste is cleaned and you can go home.
  • A detailed report will be sent to your doctor within two weeks. Your doctor will discuss the findings with you at your next appointment.


Frequently Asked Questions

Is the test safe?

The test is generally safe. The electrodes do not produce electrical discharges and do not cause pain or uncomfortable sensations.

In a small number of patients, a seizure may be triggered by the flashing lights. The medical technologist will be with you throughout the process. If a seizure occurs or if you feel unwell, the medical technologist is trained to take care of you.

Can I undergo the test if I am feeling unwell?

No. If you are feeling unwell e.g. fever, cough, do not proceed with the test. Call to reschedule your appointment.


Have questions or concerns? Call:

Tel: 6330 6363

Office Hours:
8.00am – 5.30pm, Mon – Wed, Fri
8.00am – 5.00pm, Thurs
Closed on Sat, Sun, Public Holidays

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The information is correct as of July 2021 and subject to revisions without notice.