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String test |
| Definition: |
| The string test detects the presence of intestinal parasites performed on a specimen obtained by swallowing a string. |
| Alternative Names: |
| Duodenal parasites test |
| How the test is performed: |
| You swallow a string with a weighted gelatin capsule on the end and then it is pulled back out after 4 hours. Any bile, blood, or mucus attached to the string is examined under the microscope for cell types and segments of parasites or eggs. |
| How to prepare for the test: |
| Food and fluid may be restricted for 12 hours before the test. Infants and children: The physical and psychological preparation you can provide for this or any test or procedure depends on your child's age, interests, previous experiences, and level of trust. For specific information regarding how you can prepare your child, see the following topics as they correspond to your child's age:
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| How the test will feel: |
| It may be difficult to swallow the string. Some people may vomit when the string is pulled up. |
| Why the test is performed: |
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The test is performed when there is a suspicion of parasitic infestation, and parasites are not detected by stool examination. Other possible investigations for gastrointestinal parasites include: stool samples, blood tests, and endoscopy with biopsy. |
| Normal Values: |
| No presence of blood, parasites, fungus, abnormal cells, or bile is normal. |
| What abnormal results mean: |
| Abnormal results may indicate Giardia or another parasitic infestation. |
| Special considerations: |
| Previous drug therapy can affect the test results. |
Reviewed By: Jenifer K. Lehrer, M.D., Department of Gastroenterology, Graduate Hospital, Philadelphia, PA. Review provided by VeriMed Healthcare Network.
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