EEG Test in Hyderabad — Cost, Procedure and What It Shows

If your neurologist has recommended an EEG (Electroencephalogram), you are probably wondering: what is it, why do I need it, and what will it show? This guide explains everything in simple words — so you know exactly what to expect before, during, and after the test.

What Is an EEG?

An EEG — Electroencephalogram — is a test that records the electrical activity of the brain. Your brain's nerve cells communicate with each other using tiny electrical signals. An EEG picks up these signals through small electrodes (metal sensors) attached to the scalp. It records patterns of brain waves — showing whether the brain's electrical activity is normal or abnormal.

Think of it like an ECG for the brain. Just as an ECG records your heart's electrical signals, an EEG records your brain's electrical signals.

Why Would a Neurologist Recommend an EEG?

EEG is most commonly recommended for:

• Epilepsy and seizures: The most important use. EEG can confirm epilepsy, identify the type of epilepsy, and guide medication choice.
• Unexplained blackouts or fainting: To distinguish seizures from other causes of blackout (cardiac, vasovagal)
• Absence spells / staring episodes: Especially in children
• Unexplained confusion or altered awareness
• Encephalitis (brain inflammation) or encephalopathy

What Happens During an EEG?

The procedure is completely painless. Here is what happens:

1. You lie or sit comfortably. A technician measures your head and marks points for electrode placement.
2. 20–25 small electrodes are applied to your scalp using a gel or paste. This takes 15–20 minutes.
3. The recording begins. You need to stay still and relaxed. You will be asked to breathe deeply for 3 minutes (hyperventilation), then watch a flashing light (photic stimulation) — both of which can trigger abnormal activity if present.
4. The recording typically takes 20–30 minutes.
5. The electrodes are removed, and the gel is cleaned off your hair.

"An EEG does not read your thoughts, does not send electricity into your brain, and does not hurt at all. Many patients fall asleep during the recording — which is actually helpful, as some abnormalities are only seen during drowsiness or sleep."

What Should I Do Before an EEG?

• Wash your hair the night before — do not use any hair oil, gel, or conditioner. Clean scalp gives better electrode contact.
• Do not skip your seizure medicines — unless specifically told to by your neurologist. Stopping medicines for an EEG is no longer routinely recommended.
• Avoid caffeine on the morning of the test — coffee, tea, and energy drinks increase brain arousal and may suppress abnormal activity.
• Sleep deprivation before the EEG — your neurologist may ask you to sleep less the night before. This is called a sleep-deprived EEG and is more sensitive for detecting epilepsy-related abnormalities.

What Does an EEG Show?

The neurologist reads the EEG looking for:

• Epileptiform discharges — spikes, sharp waves, or spike-and-wave complexes that indicate epilepsy
• Focal slowing — suggesting a structural brain problem in one region
• Generalised slowing — suggesting a diffuse brain condition (encephalopathy)
• Normal background activity — important reassurance that brain function is intact

An important caveat: a normal EEG does NOT rule out epilepsy. Epileptic discharges may only be present briefly, and the EEG captures just 20–30 minutes of brain activity. A normal EEG with a typical seizure history still supports an epilepsy diagnosis.

EEG at Sri Anand Child and Neuro Center — Chanda Nagar, Hyderabad

Sri Anand Neuro Center has an in-house EEG laboratory — providing same-day or next-day EEG for both adults and children. Dr. Anand Karnam personally interprets all EEGs and discusses the results with you on the same visit — you do not need to wait days or return to another appointment for the report. Available for all ages including infants and young children.

To book an EEG at Sri Anand, call +91 90633 66983.