How do I prepare for my CT scan?
How you prepare for a CT scan depends on which part of your body is being scanned. You may be asked to remove your clothing and wear a hospital gown. You'll need to remove any metal objects, such as jewelry, that might interfere with image results.
A contrast material is needed for some CT scans, to help highlight the areas of your body being examined. The contrast material blocks X-rays and appears white on images, which can help emphasize blood vessels, bowel or other structures. Contrast material can enter your body in a variety of ways.
Contrast agents can be injected into an intravenous line, to help view your gallbladder, urinary tract, liver or blood vessels. You may experience a feeling of warmth during the injection, or a metallic taste in your mouth.
To properly visualize some areas, you may need to fast for a period of time beforehand.