Imaging Services

Testing (EEG)

What is EEG?

EEG is a diagnostic test that looks at the electrical activity of your brain, using electrodes. It's a safe, easy and painless test with no known risks. Our Neurodiagnostic Testing lab offers both EEG and Video EEG Monitoring. Your doctor may order this test to help detect or rule out conditions such as:

  • Seizures (epilepsy)
  • Strokes
  • PNES (psychogenic nonepileptic seizures)
  • Brain tumor
  • Head trauma
  • Coma
  • Brain death
 Your doctor may also order an EEG for other reasons, such as investigating:
  • Headaches
  • Dizziness
  • Syncope (loss of consciousness)
  • Multiple sclerosis
  • Change in mental status
  • Memory disturbances
  • Dementia
  • Parkinson’s disease
  • Essential tremor
  • Abnormal movements
  • Visual disturbances
  • Strange sensations
  • Speech issues
  • Tics
  • Behavioral issues

Preparing for your EEG

EEG testing is easy and painless but requires a few simple steps for preparation:

  • Be sure to have clean, dry hair, free of hair spray and hair gels
  • Do not consume caffeine for 8-12 hours before the test
  • Avoid fasting the night before or the day of the test. Low blood sugar may influence the result
  • Do not stop taking any medications unless you were specifically asked to do so by your doctor.

What can I expect during an EEG? 

Our EEG tech will ask you to lie down, and 24 electrodes will be placed on your scalp using a conductive paste. While your brain activity is being recorded, you may be asked to do a variety of actions, such as opening and closing your eyes, breathing deeply and rapidly for 3-5 minutes, relaxing and keeping your head still, keeping your eyes closed while a strobe light is flashing or taking a nap. The EEG tech will guide you though these steps and answer any questions you may have during the testing. Most EEG tests last about  one and a half hours, with the recording time lasting 20-40 minutes. Your doctor may order an extended EEG with longer recording time. 

After your EEG, the electrodes will be carefully removed and the paste will be removed with a warm washcloth. In some cases, you may still have to wash your hair at home to remove the remaining paste. Your doctor will contact you with the results of your EEG a few days later, unless other arrangements with your doctor have been made.