Approximately three percent of all emergency room contacts are caused by syncopes. Despite thorough neurological and cardiological examination, more than 40% of all cases are never given a clear diagnosis. These might be caused by neurally mediated hypotension and bradycardia. Head-up tilt table test (HUT), done by the Westminster standard, provokes vasovagal syncope (VVS) in patients with recurrent unexplained syncope. VVS is believed to be caused by triggering the Bezold-Jarish reflex. Several treatments have been suggested. None of these treatments have been promising. By HUT the patient can be made aware of prodromic symptoms and be given instructions to prevent syncope. HUT is useful in the investigation of unexplained syncope.