HiIt's a Small Bowel Follow Through (SBFT). The worst part about it is that you have to be x-rayed about every 15-30 minutes for a few hours. It's not painful but there is a prep that requires that your stomach be empty at the start of the test.Here is a brief article about it: http://www.acs.ohio-state.edu/units/osuhos...ro/sm-bo-ft.pdf Roger