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    Culture - colonic tissue

    Colonic tissue culture

    A colonic tissue culture is a laboratory test to check for disease-causing bacteria, fungi, or viruses in a sample of tissue from the large intestine.

    How the Test is Performed

    The doctor removes a piece of tissue from your large intestine during a colonoscopy. For more information on how this procedure is done, see: Colonoscopy.

    The sample is sent to a laboratory. It is placed in a special dish containing a gel on whichbacteria and other organismscan grow, and stored at a certain temperature. The laboratory team checks the sample daily to see if bacteria, viruses, or fungi have grown.

    If certain microorganisms grow, more tests will be done to identify them. This helps determine the best treatment.

    How to Prepare for the Test

    There is no specific preparation needed for a culture. For information on how to prepare for the procedure to remove a piece of tissue from your large intestine, see: Colonoscopy.

    How the Test Will Feel

    The laboratory culture does not involve you, so there is no pain.

    For information on how it will feel to have a piece of large intestine tissue removed, see: Colonoscopy.

    Why the Test is Performed

    Yourhealth care providermay order this test if you have signs or symptoms of an infection that can affect the large intestine. A culture is often done when other tests such as a stool culture could not identify the cause of infection.

    Normal Results

    A normal result means that no disease-causing organisms have grown in the laboratory dish.

    Some "healthy" bacteria, called bowel flora, are normally found in the gut. The growth of such bacteria during this test does not mean there is an infection.

    Normal value ranges may vary slightly among different laboratories. Talk to yourhealth care providerabout the meaning of your specific test results.

    What Abnormal Results Mean

    An abnormal result means that disease-causing organisms have grown in the laboratory dish. Such organisms may include:

    • Clostridium difficile bacteria
    • Cytomegalovirus
    • Mycobacterium tuberculosis bacteria
    • Salmonella bacteria
    • Shigella bacteria

    These organisms may lead to diarrhea or infections involving the colon.

    Risks

    A colonic tissue culture poses no risk to you. For information on risks related to removing a sample of tissue from the large intestine, see: Colonoscopy.

    References

    DuPont HL. Approach to the patient with suspected enteric infection. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011: chap 291.

    Semrad CE. Approach to the patient with diarrhea and malabsorption. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011: chap 142.

    Giannella RA. Infectious enteritis and proctocolitis and bacterial food poisoning. In: Feldman M, Friedman LS, Brandt LJ, eds. Sleisenger & Fordtran's Gastrointestinal and Liver Disease. 9th ed. Philadelphia, Pa: Saunders Elsevier; 2010:chap 107.

    Croft AC, Woods GL. Specimen collection and handling for diagnosis of infectious diseases. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 22nd ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 63.

    Salwen MJ, Siddiqi HA, Gress FG, Bowne WB. Laboratory diagnosis of gastrointestinal and pancreatic disorders. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 22nd ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 22.

    Fritsche TR, Selvarangan R. Medical parasitology. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 22nd ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 62.

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            Tests for Culture - colonic tissue

            Review Date: 4/26/2012

            Reviewed By: Linda J. Vorvick, MD, Medical Director and Director of Didactic Curriculum, MEDEX Northwest Division of Physician Assistant Studies, Department of Family Medicine, UW Medicine, School of Medicine, University of Washington; and George F. Longstreth, MD, Department of Gastroenterology, Kaiser Permanente Medical Care Program, San Diego, California. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M. Health Solutions, Ebix, Inc.

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