This procedure examines the rectum, the large intestine and the lower part of the small intestine. A technologist will use an enema in your child’s rectum to insert fluid called barium, which is a metallic, chemical, chalky liquid used to coat the inside of organs so that they will show up on an X-ray. A special camera will show the dye as it goes into the child’s large intestine, allowing a radiologist to detect strictures (narrowed areas), obstructions (blockages) and other potential problems. The radiologist will also take another X-ray of your child’s abdomen after he or she uses the bathroom. The test takes about 30 minutes.