Seizure Count by Continuous (Prolonged) Electroencephalography

What This Test Measures

The test reviews an extended EEG recording to identify seizure events and tally how many occurred during the monitoring period. It also documents when seizures happened and how they looked on the brain-wave tracing, so patterns can be assessed over time.

How the Recording Is Done

Sensors are placed on the scalp to record electrical activity from the brain, and the recording runs for an extended period, often hours to days depending on the clinical question. You may be asked to stay in a monitoring unit, and the technologist or nurse will help keep the sensors in place during the session.

Why Your Doctor Ordered It

Prolonged EEG monitoring is commonly used when seizures are suspected but not clearly captured on a routine EEG, when seizure frequency needs to be measured, or when treatment for epilepsy is being evaluated. It can also help distinguish seizures from other events that look similar.

What to Expect

The procedure is generally safe and not painful; the main discomfort is from having sensors attached and staying still for long periods. Your care team will give you instructions about sleep, medications, and activities during monitoring, and will tell you when results are available.