A radiographer or assistant will ask you to undress and put on a hospital gown.
You will be asked to lie on the scanning table and the procedure will be explained.
You will be asked to turn on your side and a radiographer will insert a small flexible rubber tube into your bottom.
You may be given a small injection of medicine (Buscopan) that will help to relax the muscles of your bowel wall.
You may also receive an injection of a dye (contrast agent) during the test, depending on the reason you are having it.
Carbon dioxide gas is then slowly introduced into your bowel to expand it and make the walls easier to see. When this happens you may briefly feel some discomfort similar to trapped wind.
You will then have your scans taken whilst lying on your stomach and lying on your back.
When the examination is complete, the tube is removed and you will be shown into a small rest room so that you can use the toilet.