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Screening for Colon Cancer

The goal of colorectal cancer screening is to remove precancerous polyps before they develop into cancer or to diagnose a cancer in its early stages when survival is greatest. A consortium of five medical societies including surgeons and gastroenterologists, and sponsored by the United States Agency for Health Care Policy and Research, has defined separate screening protocols based on an individual’s assignment to risk categories.

How often you should be screened

Testing Methods


The use of colonoscopy is the superior alternative among testing options. Colonoscopy screens for cancer by examining the whole colon, and is a tool to prevent cancer by removing pre-cancerous colorectal polyps (polypectomy). For more information on colonoscopy including preparation and what you can expect from the test, please see the related NetWellness orginal feature.

Virtual Colonoscopy

At this time, there are not enough data to recommend CT scanning otherwise known as virtual colonoscopy, and it is currently not reimburse by insurance unless performed as a follow up to an incomplete colonoscopy. The colon is inflated with air through a tube in the rectum, and the patient has to undergo a CT scan. This procedure does not allow for polyp removal and can miss smaller polyps detected by endoscopic colonoscopy. 

Stool DNA Testing

This technology involves collection of a whole bowel movement. The cells that are shed from the lining of the colon are then isolated and checked for DNA mutations that are known to be associated with colon cancer and colon polyps. At present, the test is still under development and not commercially available.


There are many excellent support groups and references that the patient’s physician will be happy to share.  The following websites can provide further information:

The American Cancer Society can address cancer-related questions 24 hours a day at 1-800-ACS-2345. Concerns should also be addressed with a physician.

More features about colon cancer:

For more information:

Go to the Colon Cancer health topic.