This test may be done in an office or a hospital radiology department. You lie on the x-ray table and a preliminary x-ray is taken. You then lie on your side while a well-lubricated enema tube is inserted gently into your rectum. Barium, a radiopaque (shows up on x-ray) contrast medium, is then allowed to flow into your colon. A small balloon at the tip of the enema tube may be inflated to help keep the barium inside. The flow of the barium is monitored by the health care provider on an x-ray fluoroscope screen, which is like a TV monitor. Air may be puffed into the colon to distend (expand) it and provide better images. You are asked to move into different positions and the table is slightly tipped to get different views. At certain times when the x-ray pictures are taken, you hold your breath and are still for a few seconds so the images won't be blurry. The enema tube is removed after the pictures are taken and you are given a bedpan or helped to the toilet. You then expel as much of the barium as possible. One or two x-rays may be taken after the barium is expelled.
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