50-79, asymptomatic women of average risk referred for colorectal screening.
40-79 year-old asymptomatic women referred for colorectal screening with a history of colorectal cancer in a first degree relative.
History of positive stool guiaic within six months of referral.
History of iron deficiency anemia within six months of referral (Note: if patients have not had stool guiacs, complete blood cell count or ferritin performed within the last six months, then these tests will be performed at time of study enrollment).
History of normal colonoscopy or barium enema within past ten years or history of normal flexible sigmoidoscopy within past 5 years.
History of adenomatous polyps, colorectal cancer, inflammatory bowel disease, HNPCC, or familial adenomatous polyposis.
History of rectal bleeding or hematochezia within the past 12 months.
Unintentional weight loss greater than 10 pounds within previous six months.
Subjects under 18 years of age.