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Worm-specific antigen detection (stool) by immunoassay

Published: August 9, 2026Updated: August 16, 2026

This test checks for the presence of parasitic worm antigens in your stool, helping identify infections caused by worms like pinworms, roundworms, or tapeworms.

Quick summary

["Detects worm infections through stool samples using an immunoassay method."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
90300-5
Short code
Worm Spec NAA+probe
Synonyms
Worm Spec NAA+probe
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What This Test Measures

The test detects specific proteins (antigens) produced by certain parasitic worms in your stool. These antigens are unique to worms like *Ascaris*, *Enterobius*, or *Taenia*, which can cause infections. The immunoassay method uses antibodies to identify these antigens, providing a quick and sensitive way to detect active infection.

How the Test Works

A small stool sample is collected and analyzed using an immunoassay technique. This method involves exposing the sample to antibodies that bind to worm-specific antigens, allowing the lab to determine if the infection is present.

Why It Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like abdominal pain, diarrhea, weight loss, or itching (especially in the anal area), or if you live in an area with high worm infection rates. It’s also used for diagnosing suspected parasitic infections in children or travelers returning from regions with endemic worm diseases.

What to Expect Before the Test

No special preparation is needed, but you may be asked to collect a fresh stool sample (usually in a container provided). If you’re taking certain medications (like antibiotics), inform your provider, as they might affect results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Worm antigen stool test

Frequently asked questions

This test helps confirm a parasitic worm infection by detecting antigens in stool, which can guide treatment decisions. Unlike stool cultures, it doesn’t identify the worm species but confirms active infection, allowing for targeted therapy to eliminate the parasite and relieve symptoms.
This test is not used to diagnose worm eggs in stool (that would require a different test like a stool microscopy). Results may be false-negative if the infection is early or treated before testing.
What does a positive result mean?
A positive result strongly suggests an active worm infection. Your provider will work with you to determine the specific type of worm and recommend appropriate treatment, such as antiparasitic medications.
What does a negative result mean?
A negative result means no detectable worm antigens were found in this sample. However, infection could still be present if it’s very early or if the sample wasn’t collected correctly. Follow-up testing or retesting may be needed if symptoms persist.
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy