Contraindications to colon ct are when the use of colon ct causes physical harm or is not meaningful for diagnosis. Pregnancy, acute abdominal pain, vomiting, diarrhea, and recent cesarean section where the wound has not healed are contraindications to colon ct. Also, when inflammatory bowel disease is present, dilation of the colon with gas may lead to perforation, among other things. To prepare the bowel before performing a colon ct, consume an easily digestible, low residue diet, e.g., vegetables, fruits, etc., 48 hours prior to the exam. Twenty-four hours prior to the test, solid foods should be avoided and fluids should be consumed in large quantities to improve laxity. Sports or drinking water with added electrolytes, mineral water, etc. are recommended. Milk or dairy products should be avoided to minimize gas formation in the intestinal lumen.