The sites of the neuronal discharges determine the clinical manifestations of the seizure. It is estimated that about one-half of the epileptic population in California is undiagnosed or unrecognized.
Epilepsy is diagnosed by a physician following a neurological evaluation.
Frequently an EEG is ordered to determine the type and degree of brain wave abnormality. If a person with epilepsy is placed on medication to control the seizure activity, blood levels are requested periodically to determine the level of the medication in the body.