Some people with abnormal EEG results do not have
epilepsy. This is not common.
About 50% of people with
epilepsy will have normal results on their first EEG.1
If epilepsy is still suspected, a follow-up EEG may be done. This second test
may be a sleep-deprived EEG, in which the test is done after you have been
forced to stay awake for a longer period of time than usual. A sleep-deprived
EEG can sometimes reveal abnormalities that did not show up on the regular
From 10% to 40% of people with epilepsy will have normal EEG
results even after having several EEG tests done.1
Video and EEG monitoring records seizures on videotape and computer
so that the doctor can see what happens just before, during, and right after a
seizure occurs. The video records what you are doing while the EEG records the
electrical activity occurring in your brain. This type of monitoring may be
Watching your child have his or her first seizure was probably one of the most frightening moments of your life. Finding out that your child has epilepsy may have been another one. The future may suddenly seem terrifying and uncertain for both your child and your whole family. But as you may already know, the news is not nearly as bad as it sounds. Here are some things to keep in mind if your child has had a seizure:
Most children who have a seizure don't have another one.
When your medical history and repeated EEGs are
not enough to figure out what kinds of seizures you are having. Simultaneous
video and EEG recording can provide important clues about what type of seizure
you have had.
To evaluate your condition before you have epilepsy
To diagnose seizures that are not from epilepsy, such as