Dr. Adnan Fayez Almasri is a neurology specialist with the Jordanian Board and higher specialty training, following a medical degree at Jordan University of Sci…

An electroencephalogram (EEG) is a test that records the electrical activity of brain cells through small electrodes attached to the scalp, converting that activity into waveforms a neurologist interprets. It is non-invasive, sends no electrical current into the head, involves no radiation, and can be safely repeated in children, adults and during pregnancy. The main reason an EEG is ordered is to evaluate seizures: whether the event was an epileptic seizure or something that mimics one such as fainting, a panic attack, a sleep-related movement or a non-epileptic psychogenic event; what type of seizure it was; and which part of the brain it appears to arise from. It is also used to assess unexplained confusion or altered consciousness, to follow a patient with epilepsy whose seizure pattern has changed or who is being considered for withdrawal of medication, to assess selected children with developmental delay or loss of acquired skills, to monitor critically ill patients, and to help evaluate certain sleep disorders alongside other studies. The limits of the test matter just as much as its uses. A normal EEG does not rule out epilepsy, because the recording captures only a short window of time in which abnormal electrical activity may simply not appear; this is why a sleep-deprived or prolonged video EEG is sometimes requested. Conversely, minor variations on a tracing do not automatically mean epilepsy and are not treated in isolation. An EEG does not measure intelligence or personality, and it does not show tumours, strokes or multiple sclerosis, which require MRI or CT imaging instead. It does not diagnose migraine, anxiety, vertigo, or attention deficit hyperactivity disorder. Which type of EEG is appropriate, and for how long, is decided by clinical examination and by a careful account of the event from someone who witnessed it, not by reading a web page. The test delivers its real value when it is interpreted together with that clinical story rather than as a stand-alone result sheet.
Procedure steps
- 1
Clinical assessment and choice of EEG type
The physician listens to your description of the event and that of any witness, asking about its duration, what came before and after, medications, sleep loss, fever and family history. On that basis the type of recording is chosen: a routine awake study, a sleep-deprived study, a sleep recording, or prolonged video EEG over hours or days.
- 2
Scalp preparation and electrode placement
The head is measured and electrode positions are marked in a standard pattern. The skin is cleaned with a mild abrasive paste and electrodes are fixed with conductive gel or a flexible cap. Nothing penetrates the skin and placement is not painful, though you may feel the cool gel or light pressure. Setup usually takes ten to twenty minutes.
- 3
Baseline recording at rest
You lie or sit in a quiet, dimly lit room, relaxed with your eyes closed, while the technologist watches the screen. You are asked to avoid moving, talking or chewing gum, since these create artefact on the tracing. If an event happens during the study it is useful rather than alarming, and the technologist is trained to manage it.
- 4
Activation manoeuvres
To bring out abnormal activity you are asked to open and close your eyes, then to breathe deeply and rapidly for a few minutes (which may cause brief tingling or light-headedness), followed by intermittent photic stimulation. If sleep is required, a short nap period may be allowed. These manoeuvres are safe and are stopped immediately if you feel unwell.
- 5
Interpretation in clinical context
The neurologist reviews the entire recording, assessing the background rhythm and any focal or generalised abnormalities, and excluding artefact from muscle, eye movement or sweat. The report is then written alongside your clinical story, and the practical meaning and next step are explained to you: observation, brain imaging, a longer recording, or a medication plan.
Before the procedure
Tell the physician about every medication and supplement you take, and do not stop or change the dose of any anti-seizure medicine on your own before the test unless your doctor explicitly instructs you to. Wash your hair the night before with shampoo only, and avoid oil, cream, gel, spray, hair fixative and dye, since these prevent the electrodes from adhering. Eat your meals as usual so your blood sugar does not drop, and avoid coffee, tea and energy drinks on the day of the test. If a sleep-deprived recording has been requested, follow exactly the number of sleep hours your doctor specified, and arrange for someone to drive you both ways. For children, bring a favourite toy or bottle and explain in advance that the test does not hurt. Bring previous reports and imaging, a written account of the event from someone who witnessed it, and a video clip of the episode if it can be recorded safely.
After the procedure
After the test the gel is removed with water and shampoo; a sticky residue may remain and clears after one or two washes. You may return to your usual food, medication and activity immediately, except after a sleep-deprived study, when you should avoid driving and hazardous work until you have slept properly. The recording leaves no radiation and has no side effects. Results are usually reported within a few days, so book your follow-up visit and do not interpret the report yourself. **Go to the emergency department immediately if a seizure lasts more than five minutes, if two or more seizures occur without full recovery of consciousness in between, if there is breathing difficulty or blue discolouration, if the head or neck was injured during the seizure, if this was your first ever seizure, or if it came with fever and confusion, a sudden severe headache, weakness of the face or a limb, or if you are pregnant.** During any seizure, turn the person on their side, clear hard objects away, cushion the head and note the start time — and **never put anything in the mouth or forcibly restrain the limbs, a widespread myth that causes broken teeth and injuries to the mouth and shoulder**.
Expected duration
A routine EEG usually takes 20 to 40 minutes including setup, a sleep or sleep-deprived study one to two hours, and prolonged video EEG monitoring 24 to 72 hours as an inpatient, with the report typically issued within a few days.
Dr. Laith Maali is a consultant neurologist and vascular neurologist with American Board certification in both fields. He studied medicine at Jordan University …
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