An electroencephalogram records the electrical activity of the brain through small sensors placed on the scalp. It is mainly used to assess seizures and epilepsy, but it also helps in evaluating unexplained episodes of lost awareness, confusion and some brain disorders.

At Apex, patients are told to wash their hair beforehand and avoid oils, gels and sprays. The doctor will advise on whether to continue regular medicines. Sensors are attached with paste, and the patient rests while the recording is made, usually for around 20 to 40 minutes. They may be asked to breathe deeply or watch a flashing light, which can bring out abnormal activity. In some cases, a recording during sleep is advised, as it can show changes that are not visible while awake.
The test is painless and does not send electricity into the brain. The report is reviewed by a neurologist together with the symptoms.

How the Procedure Can Help

EEG can support a diagnosis of epilepsy, indicate the type of seizure and help guide the choice of medicine. It can also help distinguish seizures from other causes of attacks.

Risks and Considerations

The test is safe. Mild skin irritation from the paste can occur, and flashing lights may rarely trigger a seizure in a person with light sensitivity, so the team is prepared. A normal EEG does not rule out epilepsy, because abnormalities may not appear during a short recording.