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Colon cancer screening

  • Alternative Names

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

  • Information

    Colon cancer screening can detect polyps and early cancers. Such screening can detect changes that can be treated before symptoms develop. Regular screenings may decrease deaths and prevent pain caused by colorectal cancer.

    Several tools may be used, either alone or in combination, to screen for colon cancer:

    1. The first method is stool tests that examine your bowel movements to check 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 one used is the fecal occult blood test (FOBT). Newer stool tests are called the fecal immunochemical test (FIT) and stool DNA test (sDNA).
    2. The second method is a sigmoidoscopy exam. 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. Most health care providers recommend that the stool test and sigmoidoscopy be used together.
    3. The third method is a colonoscopy exam. A colonoscopy is similar to a sigmoidoscopy, but it allows the entire colon to be viewed. You will usually be mildly sedated during a colonoscopy.

    SCREENING RECOMMENDATIONS FOR AVERAGE-RISK PEOPLE

    There is not enough evidence to determine which screening method is best. Discuss with your doctor which test is most appropriate for you.

    Beginning at age 50, both men and women should have a screening test. Some health care providers recommend that African Americans begin screening at age 45.

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

    A test called capsule endoscopy (swallowing a small, pill-sized camera) is also being studied, but it is not yet recommended for standard screening at this time.

    SCREENING RECOMMENDATIONS 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.

    Recently there has been interest in several new screening tests for colon cancer, including checking DNA in stool samples and the fecal immunochemical test (FIT).

    See also: Colon cancer

  • 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.

    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 US Multi-Society Task Force on Colorectal Cancer, and the American College of Radiology. CA Cancer J Clin. 2008;58:130-160.

Review Date: 11/5/2009

Reviewed By: Yi-Bin Chen, MD, Leukemia/Bone Marrow Transplant Program, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

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. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- 2014 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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Christie Clinic at the Family Medical Center in Paris
727 East Court Street Paris, IL 61944 Dermatology: 366-1248; Vein and Vascular: 366-2670
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