Evacuation Proctography

Evacuation Proctography test is used to investigate any problems that you may have when you try to open your bowels. Barium paste (a chalk-like substance, which shows up on x-ray) is inserted into your rectum via an examining scope until you have the urge to go to the toilet.
 
You will then be asked to sit on a specially designed toilet in front of an x-ray machine and given instructions to open your bowels so as to pass the barium out of your back passage. While you do this, you will be given privacy behind a screen in a darkened room.