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    String test

    Duodenal parasites test

    A string test involves swallowing a string to obtain a sample from the upper part of the small intestine. The sample is then tested to detect the presence of intestinal parasites. The string test is rarely used in the United States.

    How the Test is Performed

    You swallow a string with a weighted gelatin capsule on the end. Four hours later it is pulled back out. Any bile, blood, or mucus attached to the string is examined under the microscope for cells and parasites or parasite eggs.

    How to Prepare for the Test

    You may be asked not to eat or drink anything for 12 hours before the test.

    How the Test Will Feel

    You may find it difficult to swallow the string, and you may feel an urge to vomit when the string is being removed.

    Why the Test is Performed

    The test is performed whenyour health care providersuspects that you have a parasite infection, but no parasites were found in a stool sample.

    Normal Results

    No blood, parasites, fungi, or abnormal cells is normal.

    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

    Abnormal resultsmay be a sign ofgiardia or another parasite infection.

    Considerations

    Treatment with certain drugs can affect the test results.

    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 gastrintestinal 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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    • Ascaris lumbricoides egg

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    • Gelatin capsule in stoma...

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      • Ascaris lumbricoides egg

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      • Gelatin capsule in stoma...

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      A Closer Look

        Self Care

          Tests for String test

          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.

          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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