IV contrast: is a clear liquid that is use to further enhance the contrast of the CT images. It is very helpful in clearly visualising vascular structures and is very important in some CT scan examinations. The IV contrast is given via injection into a vein mostly found in the arm. As there is a small chance of allergic reaction to the IV contrast please be sure to mention any known allergies, asthma or kidney problems.
Water or Oral Contrast: is consumed before a CT scan of the abdomen. It is used to differentiate the bowel from other abdominal structures that lie very close to the bowel.