An electroencephalogram (EEG) is a test that records and evaluates the electrical activity in the brain. There are different ways that EEG is used to diagnose and monitor and variety of conditions:

  • Routine and portable EEG. This form of EEG is often used to evaluate people with epilepsy. It records brain activity for 20 to 30 minutes.
  • Outpatient prolonged video EEG. This type of EEG records video and the brain’s electrical activity for 1 to 2 hours or up to three days at home.
  • Intraoperative monitoring for neurosurgery and orthopedic surgery. This is an inpatient for of EEG that monitors a patient’s brain activity during a surgical procedure.
  • Extensive long-term video EEG. This inpatient type of EEG is used for medical and surgical treatment of epilepsy. It can also be monitor patients in critical care, especially in the neonatal, pediatric and cardiovascular intensive care units. Extensive long-term video EEG is often used to monitor patients as they are weaned off certain medicines or to create certain reactions to test brain activity.