Electroencephalogram (EEG)

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An electroencephalogram (EEG) is a test that measures patterns of electricity in the brain. Learn about why an EEG may be performed and what to expect.

Key points

  • An EEG is a test that looks at patterns of electricity in the brain.
  • Children have EEGs if doctors think there might be a problem with the brain.
  • An EEG takes about an hour.
  • Children might be sedated for the test if they cannot lie still.
Last updated: November 6th 2009