Recently my Nueroligist ordered a tilt table test and during the 90 degree stand, I passed out. It was at the 19 minute Mark I believe. I remember seeing my BP at 20/15 on the monitor after I awoke. A week later my doctor called and said all test were normal? By the way I was not give the intervenes drug to induce syncope. Could anyone tell me why this might be a negative test when you pass out?