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    Colon cancer screening

    Screening for colon cancer; Colonoscopy - screening; Sigmoidoscopy - screening; Virtual colonoscopy - screening

    Colon cancer screening can detect polyps and early cancers in the intestines. This type ofscreening can find problems that can be treated before cancer develops or spreads. Regular screenings may reduce the risk of death and pain caused by colorectal cancer.

    SCREENING TESTS

    There are several ways to screen for colon cancer.

    Stool test:

    • This method checks your bowel movements for blood.
    • Polyps in the colon and smaller cancers often cause small amounts of bleeding that cannot be seen with the naked eye.
    • The most common test used is the fecal occult blood test (FOBT). Newer ones are called the fecal immunochemical test (FIT) and stool DNA test (sDNA).

    Sigmoidoscopy:

    • This test uses a flexible small scope to look at the lower part of your colon. Because it only looks at the last one-third of the large intestine (colon), it may miss some cancers.
    • A stool test and sigmoidoscopy should be used together.

    Colonoscopy:

    • A colonoscopy is similar to a sigmoidoscopy, but the entire colon can be viewed.
    • Mild sedation is usually usedduring a colonoscopy.
    • Sometimes, CT scans are used as an alternative to a regular colonoscopy. This is called a virtual colonoscopy.

    Other tests:

    • Double-contrast barium enema is a special x-ray of the large intestine that looks atthe colon and rectum
    • Capsule endoscopy involves swallowing a small, pill-sized camera. It is being studied, but it is not recommended for standard screening at this time.

    SCREENING FOR AVERAGE-RISK PEOPLE

    There is not enough evidence to say which screening method is best.Talk to your doctor about which test isright for you.

    Both men and women should have a colon cancer screening test starting at age 50. Some health care providers recommend that African Americans begin screening at age 45.

    Screening options for patients with an average risk for colon cancer:

    • Colonoscopy every 10 years
    • Double-contrast barium enema every 5 years
    • Fecal occult blood test (FOBT) every year (colonoscopy is needed if results are positive)
    • Flexible sigmoidoscopy every 5 - 10 years, usually with stool testing FOBT done every 1 - 3 years
    • Virtual colonoscopy every 5 years

    SCREENING FOR HIGHER-RISK PEOPLE

    People with certain risk factors for colon cancer may need earlier (before age 50) or more frequent testing.

    More common risk factors are:

    • A family history of inherited colorectal cancer syndromes, such as familial adenomatous polyposis (FAP) or hereditary nonpolyposis colorectal cancer (HNPCC)
    • A strong family history of colorectal cancer or polyps. This usually means first-degree relatives (parent, sibling, or child) who developed these conditions younger than age 60.
    • A personal history of colorectal cancer or polyps
    • A personal history of chronic inflammatory bowel disease (for example, ulcerative colitis or Crohn's disease)

    Screening for these groups of people is more likely to be done using colonoscopy.

    References

    Whitlock EP, Lin JS, Liles E, Beil TL, Fu R. Screening for colorectal cancer: a targeted, updated systematic review for the U.S. Preventive Services Task Force. Ann Intern Med. 2008;149:638-658.

    Rex DK, Johnson DA, Anderson JC, Schoenfeld PS, Burke CA, Inadomi JM; American College of Gastroenterology. American College of Gastroenterology guidelines for colorectal cancer screening 2009 [corrected]. Am J Gastroenterol. 2009;104:739-750.

    Lieberman DA. Clinical practice. Screening for colorectal cancer. N Engl J Med. 2009;361:1179-1187.

    Burt RW, Barthel JS, Dunn KB, et al. NCCN clinical practice guidelines in oncology. Colorectal cancer screening.J Natl Compr Canc Netw.2010 Jan;8(1):8-61.

    Levin B, Lieberman DA, McFarland B, Smith RA, Brooks D, Andrews KS, 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 U.S. Multi-Society Task Force on Colorectal Cancer, and the American College of Radiology. CA Cancer J Clin. 2008;58:130-160.

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    • Colon cancer screening

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    • Colonoscopy

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    • Sigmoid colon cancer, X-...

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    • Large intestine anatomy

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    • Colon cancer screening

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    • Colonoscopy

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    • Sigmoid colon cancer, X-...

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    • Large intestine anatomy

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    A Closer Look

    Talking to your MD

      Self Care

        Tests for Colon cancer screening

        Review Date: 10/8/2012

        Reviewed By: George F. Longstreth, MD, Department of Gastroenterology, Kaiser Permanente Medical Care Program, San Diego, California. Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, David R. Eltz, and Stephanie Slon.

        The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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