I had it a long time ago so I really don't know if it is done the same now or not. But I had to have an IV put it, just capped though in case it was needed and of course hooked up to monitor, heart and blood pressure, who knows maybe even oxygen monitor. Got baseline readings then started tilting me up and down to see how my body reacted. Did B/P drop, did I pass out, throw up. anyway I did fine and it was nonconclusive except to the insurance company who concluded that they got some more money out of me.

Good luck