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.
Duodenal parasites test
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
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 when your health care provider suspects that you have a parasite infection, but no parasites were found in a stool sample.
No blood, parasites, fungi, or abnormal cells is normal.
Normal value ranges may vary slightly among different laboratories. Talk to your health care provider about the meaning of your specific test results.
What abnormal results mean
Abnormal results may be a sign of
Treatment with certain drugs can affect the test results.