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Hi, i want to know about the EEG test. Hi, i want to know about the EEG test. 1 . Is there 3 steps to the test? 2. How long does each step of test last?

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Dr. Frances Dyro
Neurology

In brief: An

An eeg test or electroencephalogram is an electrical test.
Often called a brainwave test it is similar to an electrocardiogram of the heart. It involves placing numerous electrodes on the scalp and recording electrical activity generated by your brain. The newer recording devices are computerized and have made the recordings faster. In the old days a series of recordings were made sampling activity from one set of electrodes compared to electrodes on the opposite side of the scalp using multiple combinations of electrodes. This is now done via computer. There is a portion of the test that measures the response of the brain waves to hyperventilation(heavy breathing) and a third part looks at the brain's response to strobe light flashing at different frequencies. Depending on what your doctor is suspecting she may request that you stay up late the night before and skip coffee to enable you to sleep during the test. Sometimes the test is done in the fasting state but not usually. An ordinary waking eeg usually takes about a half an hour. If a sleep study is requested. It will be longer. Occasionally 24 hour monitoring may be requested. This is done with video monitoring in the hospital if epilepsy is a question. Occasionally the patient is hooked up and allowed to go home with the electrodes and a recording device that stay on for a day. There is no discomfort associated with the test.

In brief: An

An eeg test or electroencephalogram is an electrical test.
Often called a brainwave test it is similar to an electrocardiogram of the heart. It involves placing numerous electrodes on the scalp and recording electrical activity generated by your brain. The newer recording devices are computerized and have made the recordings faster. In the old days a series of recordings were made sampling activity from one set of electrodes compared to electrodes on the opposite side of the scalp using multiple combinations of electrodes. This is now done via computer. There is a portion of the test that measures the response of the brain waves to hyperventilation(heavy breathing) and a third part looks at the brain's response to strobe light flashing at different frequencies. Depending on what your doctor is suspecting she may request that you stay up late the night before and skip coffee to enable you to sleep during the test. Sometimes the test is done in the fasting state but not usually. An ordinary waking eeg usually takes about a half an hour. If a sleep study is requested. It will be longer. Occasionally 24 hour monitoring may be requested. This is done with video monitoring in the hospital if epilepsy is a question. Occasionally the patient is hooked up and allowed to go home with the electrodes and a recording device that stay on for a day. There is no discomfort associated with the test.
Dr. Frances Dyro
Dr. Frances Dyro
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