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Results
By Mayo Clinic staffYour doctor will review the results of the fecal occult blood test and then share the results with you.
- Negative result. A fecal occult blood test is considered negative if no blood is detected in your stool samples. If you had the test to screen for colon cancer and you're at average risk — you have no colon cancer risk factors other than age — your doctor may recommend waiting one year and then repeating the test.
- Positive result. A fecal occult blood test is considered positive if blood is detected in your stool samples. You may need additional testing — such as a colonoscopy — to locate the source of the bleeding.
It's important to remember that false-negative and false-positive results are possible. Some cancers and most polyps don't bleed, which may lead to a false-negative result. Likewise, occult bleeding may come from sources other than colon cancer or a polyp — a false-positive — such as from a stomach ulcer, hemorrhoid, or even blood swallowed from your mouth or nose.
- Levin B, et al. Screening and surveillance for the early detection of colorectal cancer and adenomatous polyps, 2008: A joint guideline from the American Cancer Society, the US Multi-Society Task Force on Colorectal Cancer, and the American College of Radiology. Gastroenterology. 2008;134:1570.
- Hundt S, et al. Comparative evaluation of immunochemical fecal occult blood tests for colorectal adenoma detection. Annals of Internal Medicine. 2009;150:162.
- Fecal occult blood test: The test sample. American Association for Clinical Chemistry. http://www.labtestsonline.org/understanding/analytes/fecal_occult_blood/sample.html. Accessed March 12, 2009.
- Fecal occult blood test: The test. American Association for Clinical Chemistry. http://www.labtestsonline.org/understanding/analytes/fecal_occult_blood/test.html. Accessed March 12, 2009.
- Bynum TE. Evaluation of occult gastrointestinal bleeding. http://www.uptodate.com/home/index.html. Accessed March 12, 2009.
- Pignone M, et al. Meta-analysis of dietary restriction during fecal occult blood testing. Effective Clinical Practice. 2001;4:150.
- Van Rossum LG, et al. Random comparison of guaiac and immunochemical fecal occult blood tests for colorectal cancer in a screening population. Gastroenterology. 2008;135:82.
