[Exams in epilepsy: how? for whom? how far?].

The diagnosis of epilepsy remains clinical. However some investigations must be carried out in order to confirm the diagnosis, establish the epileptic syndrome with accuracy and seek the etiology. The first line investigations are EEG, morphological imaging (cerebral MRI, CT scan) as well as standard blood test. The latter also permit patient management in some cases. Indeed, video-EEGs monitoring are used to explore refractory epilepsy in order to optimize treatment or carry out presurgical assessment. In this paper, we present these investigations after which we discuss how they are to be used.