An EEG, or electroencephalogram, is a test that records the electrical signals of the brain by using small metal discs (called electrodes) that are attached to your scalp. Your brain cells communicate with each other using electrical impulses. They’re always working, even if you’re asleep. That brain activity will show up on an EEG recording as wavy lines. It’s a snapshot in time of the electrical activity in your brain.
Why do EEG test ?
EEGs are used to diagnose conditions like:
- Brain tumors
- Brain damage from a head injury
- Brain dysfunction from various causes (encephalopathy)
- Inflammation of the brain (encephalitis)
- Seizure disorders including epilepsy
- Sleep disorders
How to Preparing for an EEG ?
There are some things you should do to prepare for EEG:
- Don’t eat or drink anything with caffeine for 8 hours before the test.
- Eat normally the night before and day of the procedure. Low blood sugar could mean abnormal results.
- Let your doctor know about any medications -- both prescription and over-the-counter -- and supplements you're taking.
- Wash your hair the night before the test. Don't use any leave-in conditioning or styling products afterward. If you are wearing extensions that use glue, they should be removed.