St. Elizabeth'sServices and Clinical CentersNeurology and Neurosurgery

EEG (Electroencephalograph) Patient Information

During the EEG test you will be lying down. Approximately 24 small metal discs are applied to the scalp in a gel, but first the area is prepared by rubbing with a pumice-coated Q-Tip.

During the test you will be asked to open and close your eyes. You may also be asked to take deep breaths (hyperventilate) for three minutes and may be shown a strobe light that flashes at different frequencies. These activities help show different brain wave patterns that are useful for diagnosis. Sometimes the physicians may want to record brain wave patterns that occur during sleep. In this case you will be asked to limit the amount of sleep you get the night before the test.

This test may take 1 to 1-1/2 hours and is painless.

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