Cryptosporidium Antigen in Stool (Qualitative)
This test checks for the presence of Cryptosporidium, a microscopic parasite that can cause diarrhea, especially in people with weakened immune systems.
["Helps diagnose infections from the Cryptosporidium parasite in stool samples."]
Key facts at a glance
- LOINC
- 108653-7
- Short code
- Cryptosp DNA Msmt Stl
- Synonyms
- Cryptosp DNA Msmt Stl
- 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 healthcare provider may recommend this test if you have persistent diarrhea, especially after traveling to areas with poor sanitation, or if you have a condition that weakens your immune system, like HIV/AIDS or certain types of cancer. It’s also used in monitoring patients in healthcare settings where outbreaks have occurred.
What to Expect Before the Test
No special preparation is needed. You’ll provide a sample of your stool in a container provided by your lab. If you’re in a clinical setting, staff will guide you through the process.
What the Test Results Mean
A positive result means Cryptosporidium parasites were found in your stool, confirming an infection. A negative result means no parasites were detected, but other causes of diarrhea could still be present. Follow-up testing or additional questions may be needed.
Common Causes of False Results
False negatives can occur if the sample wasn’t collected correctly or if the infection is very early or recent. False positives are rare but can happen if other substances are present in the stool.
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 is a common cause of watery diarrhea, particularly in immunocompromised individuals. Early diagnosis helps manage symptoms and prevents dehydration. Treatment focuses on supportive care, hydration, and sometimes medications to reduce symptoms, though antibiotics are not always effective.
Short name
Stool Cryptosporidium Test
Frequently asked questions
How long does it take to get results?
Can I eat or drink before giving a stool sample?
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