Lord, when I had upper and lower GI's done I had to drink Barrium, then I had to drink two 8 oz cups of it for another study... I simply refused to do it. I always say I will undergo any sugury or procedure but they'll have to kill me before I drink Barrium again. Anyway my tests were done lying down or somewhat sitting. Don't worry, I don't think you will have to like stand or anything. Hope everything turns out well for you