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Colon cancer screening include colonoscopy, fecal occult blood tests, flexible sigmoidoscopy, virtual colonoscopy, and air contrast barium enema.
http://www.medicinenet.com/colon_cancer_screening/article.htm
Accuracy and Reliability of Screening Tests.
http://www.ahrq.gov/clinic/3rduspstf/colorectal/colorr.htm
Colon cancer experts from the National Naval Medical Center (NNMC) participated in a collaborative study with the National Cancer Institute that found colonoscopy detects cancer better than other screening methods in women.
http://www.navy.mil/search/display.asp?story_id=18572