How many EEGs are needed to establish the diagnosis of Epilepsy?

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Epilepsy is a clinical diagnosis and cannot be excluded by normal EEGs.The answer depends on the type of epilepsy and results of studies vary.Overall,from 29 % to 69 % outpatients with the clinical diagnosis of epilepsyhadinterictal epileptiform activation a single EEG.Miltiple EEGS, up to4 may enhance the yield up to 92 %, but furthered have minimal benefits. Untreated patients with absence seizures usually have abnormal routein EEG.The diagnostic yield of EEG also may be increased by prolonged monitoring ,including sleep and video EEG

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