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String test

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Ascaris lumbricoides egg Gelatin capsule in stomach

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String test

Definition:

This test involves swallowing a string to obtain a sample, which is then tested to detect the presence of intestinal parasites. The string test is rarely performed in the U.S.

Alternative Names:
Duodenal parasites test

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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.

For infants and children:

The preparation you can provide for this test depends on your child's age and experience. For specific information regarding how you can prepare your child, see the following:

• Infant test or procedure preparation (birth to 1 year)
• Toddler test or procedure preparation (1 to 3 years)
• Preschooler test or procedure preparation (3 to 6 years)
• Schoolage test or procedure preparation (6 to 12 years)
• Adolescent test or procedure preparation (12 to 18 years)

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 pulled up.

Why the test is performed:

The test is performed when there is a suspicion of parasitic infestation but parasites are not detected by stool examination.

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