56 patients with Bell's palsy were tested with electroneuronography (ENoG and Blink reflex (BR) within the 5th and 15th day of onset of facial paralysis. The recovery at the end of evolution was evaluated with the study of facial function. This retrospective study showed that ENoG is able to predict with a very low risk of error a good prognosis when more than 10 percent (strictly, of fibers (non degenerated and blocked) are active. On the other hand only persistence or early recovery of BR can assure a good prognosis whereas the absence do not permit to conclude.