(Computed Tomography Colonography; Virtual Colonoscopy)
CT colonography is a radiology test that looks at your large intestines, also called your colon. It is one of many options for colon cancer screenings.
Reasons for Test TOP
This test is used to look for polyps or cancers of the colon.
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Possible Complications TOP
CT colonography is safe. It can be used if you are too sick to have other forms of colon cancer screening.
In some cases, a contrast material is used. One complication may be an allergic reaction to the contrast.
What to Expect TOP
Prior to Test
- Do not eat for 8-12 hours prior to the test.
- A bowel cleansing will be done with a laxative. The goal of the cleansing is to rid your colon of all stool. The laxative will cause you to have many bowel movements over several hours.
- If you have diabetes, talk to your doctor about adjusting your medications.
Description of the Test
You will be positioned on your back on a movable x-ray table. Just before the test, a small tube will be inserted into your rectum. Air will be gently pumped through this tube. The table will move slowly though the donut-shaped CT scanner. While this is happening, you will need to lie very still. You will be asked to hold your breath during the scan. The scanning test will then be repeated with you lying on your stomach.
After Test TOP
You will be able to leave after the test is done. You can resume your normal diet and activities.
How Long Will It Take? TOP
Will It Hurt? TOP
You may feel cramping and bloating. You may feel the urge to have a bowel movement.
Call Your Doctor TOP
If you were given contrast, call your doctor if you notice:
- Difficulty breathing
If you think you have an emergency, call for emergency medical services right away.
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Updated May 16, 2014. Accessed September 17, 2014.
Last Updated: 9/17/2014