String test
Alternate Names : Duodenal parasites test
Definition
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.
Why is the Test Performed?
The test is performed when the doctor suspects a parasite infection, but no parasites were found in a stool sample.
How is the Test 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 will the Test Feel?
You may find it difficult to swallow the string, and you may feel an urge to vomit when the string is being removed.
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