What is an EEG?
An Electroencephalogram (EEG) is a non-invasive diagnostic test that records electrical activity in your brain through small electrodes attached to your scalp.
Purpose of the Test
- Diagnose epilepsy and other seizure disorders
- Evaluate brain activity after head injury
- Investigate sleep disorders
- Monitor brain activity during surgery
- Diagnose brain conditions like encephalitis or tumors
Before the Test
Preparation Steps
- Wash your hair the night before (avoid conditioners or styling products)
- Follow your doctor's instructions about medication adjustments
- Avoid caffeine for 12 hours before the test
- Get adequate sleep unless instructed otherwise
During the Procedure
What to Expect
- Small electrodes will be attached to your scalp with special paste
- You'll lie still on a bed or recline in a chair
- The test typically takes 1-2 hours
- You may be asked to:
- Open and close your eyes
- Breathe deeply
- Look at flashing lights
- Sleep briefly
After the Test
- Electrode paste will be removed
- You can resume normal activities immediately
- Results will be interpreted by a neurologist
Risks and Considerations
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Safety: EEGs are completely safe and painless
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Discomfort: Minimal; some find the electrodes slightly uncomfortable
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Results: May take several days to analyze
When to Expect Results
Your healthcare provider will review the results within 1-2 weeks and discuss any findings during your follow-up appointment.
Common Questions
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Can I eat before the test? Yes, unless specifically instructed otherwise
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Will it hurt? No, the procedure is painless
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How should I dress? Wear comfortable, loose-fitting clothing
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Can I drive after? Yes, there are no restrictions after the test