electroencephalography (eeg)
ImagingNone (procedure) sampleResults 3-5 daysNo fasting
Electroencephalography (EEG)
An EEG records the brain's electrical activity through small sensors placed on the scalp. It helps doctors assess seizures and other conditions affecting brain function.
Sample
None (procedure)
Results
3-5 days
Fasting
Not required
Follow-up
Optional add-on
What this test detects
Brain electrical activity
Electroencephalography
Radiologist's descriptive report
When to get this test
Seizure evaluation
Helps diagnose and monitor seizure or epilepsy activity.
Unexplained spells
Investigates fainting, blackouts, or unusual episodes.
Brain function concerns
Assesses conditions affecting alertness, sleep, or behavior.
How to prepare
01
Wash your hair the night before and avoid hair products; sleep instructions may be given.
Common questions
Does it hurt?
No. The sensors only read activity from the scalp surface and cause no pain.
Is it safe?
Yes. An EEG only records signals and does not pass any current into the body.
How long does it take?
A standard recording usually takes about 30 to 60 minutes.