Understanding Lab Tests for Pinworm Infection
Written by Private MD Labs Medical Writing Team • Last Updated: September 8, 2025
Pinworm infection, also known as enterobiasis, is one of the most common parasitic infections, particularly affecting children. These small, thread-like worms live in the large intestine and can cause uncomfortable symptoms including anal itching, especially at night when female worms lay their eggs.
Recommended Test
Ova & Parasites w/Giardia Antigen (Stool)
This comprehensive stool test is designed to detect pinworm eggs (ova) and parasites, providing direct evidence of an active intestinal infection. The test can identify various parasitic organisms including pinworms, confirming the diagnosis and enabling appropriate treatment to be initiated.
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Diagnosing Pinworm Infection
While symptoms like nighttime anal itching may suggest a pinworm infection, definitive diagnosis requires laboratory testing to detect the presence of pinworm eggs (ova) and parasites. This confirmation is essential before starting treatment with antiparasitic medications.
Understanding Test Results
A positive result indicates the presence of pinworm eggs or parasites in the stool sample, confirming an active infection that requires treatment. A negative result may suggest no current infection, though in some cases, repeat testing might be recommended if symptoms persist, as pinworms don't always shed eggs consistently.
Important Considerations
The information here is for educational purposes only and is not a substitute for professional medical advice. Always consult with a healthcare provider for diagnosis and treatment. Proper collection of the stool sample according to laboratory instructions is crucial for accurate results.
