Cryptosporidium Antigen in Stool (Qualitative)
This test checks for the presence of Cryptosporidium parasites in your stool, which can cause diarrhea and other gastrointestinal symptoms.
["Helps diagnose infections from a common parasite linked to waterborne outbreaks and immune-compromised individuals."]
Key facts at a glance
- LOINC
- 21233-2
- Short code
- Cryptosp Ag Stl Ql
- Synonyms
- Cryptosp Ag Stl Ql
- Category
- coagulation
- Sample
- stool
- Container
- Clean container
- Units
- N/A
- Ref low
- 0.8
- Ref high
- 1.2
- Critical range
- — – 5 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 85610
- SNOMED
- 396252006
- Specimen volume
- 5 g
- Stability
- Refrigerated: 24h, Frozen: 7d
- TAT
- 4–24 hours
- Order
- routine
Why This Test Might Be Ordered
Your doctor may recommend this test if you’ve experienced persistent diarrhea, especially after travel to areas with poor sanitation, or if you have a weakened immune system (e.g., from HIV/AIDS, chemotherapy, or other conditions). It’s also used in outbreaks or when other causes of diarrhea haven’t been found.
What to Expect Before the Test
No special preparation is needed. Bring a fresh stool sample to your lab or clinic. If testing at home, follow the instructions provided to collect the sample correctly.
What Happens During the Test
The test involves analyzing a small portion of your stool using an immunoassay method to detect Cryptosporidium parasite antigens. Results are typically available within 24 hours.
What the Results Mean
A positive result means Cryptosporidium parasites were found in your stool, confirming an infection. A negative result means no parasites were detected at the time of testing, but infection could still be present or have cleared.
Reference range
INR: 0.8-1.2 (warfarin: 2.0-3.0)N/A
Inform your healthcare provider if you are taking blood thinners. No special preparation required.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Cryptosporidium infections are often linked to contaminated water or food, especially in travelers or those with weakened immune systems. Early diagnosis is important to manage symptoms and prevent dehydration. Treatment focuses on supportive care (hydration, rest) and avoiding contaminated sources.
Short name
Stool Cryptosporidium Test
Frequently asked questions
How long does it take to get results?
Can I drink or eat before the test?
Is this test covered by insurance?
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