Your provider ordered an EEG test. How long does an EEG test take, and what can you do to prepare?
EEGs can be a crucial part of diagnosing conditions such as epilepsy, sleep disorders, and other neurological issues.
The length of time an EEG takes depends on several factors. Your provider may order EEGs for a specific duration:
- Routine EEGs typically last between 30 minutes and 1 hour.
- Extended EEGs can last several hours.
- Ambulatory EEGs are ordered for 24, 48, or 72 hours (the setup is done on-site, and the remainder of the recording is done at home).
- In-hospital EEGs may be ordered for multiple days, like an ambulatory EEG, but without going home.
- Expect an additional 30 minutes for your EEG technologist to set up the equipment, obtain an accurate history, and clean up when the testing is complete.
Thorough preparation will ensure smooth and accurate testing. It is essential to have clean, dry hair free from any products or chemicals. Products like hair sprays or conditioners can interfere with electrode placement and cause discomfort when the EEG leads are applied to your scalp.
Your provider may have ordered a sleep-deprived EEG, which requires you to get very little sleep the night before your exam. This may involve a team effort, especially if the test is ordered for a child who needs to stay awake later than usual. The goal of a sleep-deprived EEG is for you to fall asleep during the test. Getting less sleep than usual will help you naturally fall asleep. It is also important to avoid caffeine before your test, so skip that morning coffee or tea!
Wearing loose, comfortable clothing is ideal for an EEG. Loose clothing allows the technologist to add additional leads at the top of your chest to monitor your heartbeat. You will need to remain still during the test to obtain accurate results, and uncomfortable clothing can cause distractions, leading to frequent movement.
When the EEG is complete, the electrodes will be removed, and your scalp and hair will be cleaned with a washcloth to remove any prep materials. It’s important to note that you may still have some residue left in your hair, so don’t schedule this on picture day! A normal head wash will remove any remaining residue. You can resume normal activities after your EEG, including enjoying that cup of coffee you missed out on!
Being informed about your EEG procedure and what to expect will help calm your nerves and ensure you’re fully prepared for the test. Remember, your healthcare team is there to guide you every step of the way, and with the right preparation, your EEG will go smoothly. If you have any questions or concerns before your appointment, don’t hesitate to reach out to your provider.
Written by: Alexis Gerber, BS, R. EEG T., CLTM
