What about testing for colorectal cancer using new technology?

A: Although virtual colonoscopy and stool DNA testing are in use in some settings, data are not yet sufficient to support these tests for colorectal cancer screening. Research studies are being conducted to evaluate their effectiveness as screening tests, especially compared to those screening tests already recommended for Colorectal Cancer.

Computed tomographic (CT) colonography, commonly referred to as virtual colonoscopy, uses multiple CT images to create a 3-dimensional view of the colon. As is the case with traditional colonoscopy, a patient must prepare for virtual colonoscopy by drinking a strong laxative to thoroughly cleanse the colon. Air is pumped into the rectum to expand the rectum and colon. If a polyp or abnormality is found, it cannot be removed during this procedure. A follow-up colonoscopy, using a lighted tube inserted into the rectum and the colon, will be necessary to remove polyps or take tissue samples for further analysis. Because virtual colonoscopy is still considered experimental, most insurance plans do not cover the procedure.

Molecular testing of genetic material (DNA) in stool is a promising technology that may become an option for screening in the future. This technique has not yet been shown to detect pre-cancerous polyps and is still experimental.