: Zonulin [Mass concentration] in Stool
: This test measures the amount of zonulin, a protein associated with intestinal permeability, in a stool sample. It is sometimes used in research or specialized gastrointestinal evaluations.
[": Stool zonulin testing measures a protein linked to gut barrier function, but its clinical usefulness is still being studied."]
Key facts at a glance
- LOINC
- 99399-8
- Short code
- Zonulin Stl-mCnc
- Synonyms
- Zonulin Stl-mCnc
- Category
- chemistry
- Sample
- stool
- Container
- Clean container
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Specimen volume
- 5 g
- Stability
- Refrigerated: 24h, Frozen: 7d
- TAT
- 4–24 hours
- Order
- routine
: What Is Zonulin?
: Zonulin is a protein produced in the body that helps regulate the tight junctions between cells lining the intestine. These junctions control how easily substances pass through the gut wall. Zonulin is thought to play a role in intestinal permeability, sometimes described as "leaky gut."
: Why Measure It in Stool?
: Measuring zonulin in stool is one way researchers and some clinicians explore gut barrier function. Stool testing is noninvasive and may be included in specialized gastrointestinal evaluations, though it is not a routine or standard test for most patients.
: How the Test Is Done
: You provide a stool sample, typically collected at home using a supplied kit and returned to the laboratory. No special preparation is usually required unless your provider gives specific instructions.
: What Results May Mean
: Results are reported as a mass concentration in the stool. Because reference ranges and clinical interpretation are not well standardized, results should always be discussed with your healthcare provider in the context of your symptoms and other tests.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
: Zonulin is an area of active research in gastroenterology, with interest in conditions such as celiac disease, inflammatory bowel disease, and irritable bowel syndrome. However, stool zonulin testing is not established as a reliable diagnostic tool for most conditions, and its clinical significance remains uncertain. Interpretation should be done cautiously by a qualified clinician.
Short name
: Stool Zonulin
Frequently asked questions
: Is stool zonulin testing a standard diagnostic test?
: Does an abnormal zonulin result mean I have a gut problem?
: How should I prepare for this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
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