Locations Main Campus: Chesterfield, MO 63017   |   Locations
314-434-1500 314-434-1500   |   Contact Us

Multimedia Encyclopedia


 
E-mail Form
Email Results

 
 
Print-Friendly
Bookmarks
bookmarks-menu

String test

Duodenal parasites test; Giardia - string 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 look for intestinal parasites.

How the Test is Performed

 

To have this test, you swallow a string with a weighted gelatin capsule on the end. The string is pulled out 4 hours later. Any bile, blood, or mucus attached to the string is examined under the microscope. This is done to look 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 hard to swallow the string. You may have an urge to vomit when the string is being removed.

 

Why the Test is Performed

 

The test is performed when your health care provider suspects that you have a parasite infection. Usually a stool sample is tested first. A string test is done if the stool sample is negative.

 

Normal Results

 

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

Normal value ranges may vary slightly among different laboratories. Talk to your provider about the meaning of your test results.

 

What Abnormal Results Mean

 

Abnormal results may be a sign parasite infection such as giardia.

 

Considerations

 

Treatment with certain drugs can affect the test results.

 

 

References

Beavis, KG, Charnot-Katsikas, A. Specimen collection and handling for diagnosis of infectious diseases. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 23rd ed. Philadelphia, PA: Elsevier; 2017:chap 64.

Bope ET, Kellerman RD. The infectious diseases. In: Bope ET, ed. Conn's Current Therapy 2016. Philadelphia, PA: Elsevier; 2016:chap 3.

Haines CF, Sears CL. Infectious enteritis and proctocolitis. In: Feldman M, Friedman LS, Brandt LJ, eds. Sleisenger and Fordtran's Gastrointestinal and Liver Disease. 10th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 110.

Hall GS, Woods GL. Medical bacteriology. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 23rd ed. Philadelphia, PA: Elsevier; 2017:chap 58.

Hill DR, Nash TE. Giardia lamblia. In: Bennett JE, Dolin R, Blaser MJ, eds. Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases. 8th ed. Philadelphia, PA: Elsevier Saunders; 2015:chap 281

Siddiqi HA, Salwen MJ, Shaikh MF. Laboratory diagnosis of gastrintestinal and pancreatic disorders. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 23rd ed. Philadelphia, PA: Elsevier; 2017:chap 22.

 
  • Ascaris lumbricoides egg

    Ascaris lumbricoides egg - illustration

    Ascaris lumbricoides

    Ascaris lumbricoides egg

    illustration

  • Gelatin capsule in stomach

    Gelatin capsule in stomach - illustration

    A string test is performed to detect the presence of intestinal parasites. A weighted gelatin capsule attached to a string is swallowed and left in place. After about 4 hours, the gelatin capsule is pulled out of the stomach by the string. Any bile, blood, or mucus remaining on the string is examined under the microscope for cell types and segments of parasites or eggs.

    Gelatin capsule in stomach

    illustration

    • Ascaris lumbricoides egg

      Ascaris lumbricoides egg - illustration

      Ascaris lumbricoides

      Ascaris lumbricoides egg

      illustration

    • Gelatin capsule in stomach

      Gelatin capsule in stomach - illustration

      A string test is performed to detect the presence of intestinal parasites. A weighted gelatin capsule attached to a string is swallowed and left in place. After about 4 hours, the gelatin capsule is pulled out of the stomach by the string. Any bile, blood, or mucus remaining on the string is examined under the microscope for cell types and segments of parasites or eggs.

      Gelatin capsule in stomach

      illustration

    A Closer Look

     

      Self Care

       

        Tests for String test

         

         

        Review Date: 5/11/2016

        Reviewed By: Subodh K. Lal, MD, gastroenterologist with Gastrointestinal Specialists of Georgia, Austell, GA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.

        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.
        adam.com

         
         
         

         

         

        A.D.A.M. content is best viewed in IE9 or above, Firefox and Google Chrome browser.



        Content is best viewed in IE9 or above, Firefox and Google Chrome browser.