Cryptosporidium Stool Antigen Test by Immunofluorescence
This test detects the presence of Cryptosporidium parasites in your stool. Cryptosporidium is a microscopic parasite that can cause gastrointestinal illness, often leading to diarrhea, stomach cramps, and nausea.
["Identifies potential infection with Cryptosporidium, a common cause of diarrhea in both children and adults."]
Key facts at a glance
- LOINC
- 82205-6
- Short code
- Cryptosp DNA Stl Ql NAA+n-prb
- Synonyms
- Cryptosp DNA Stl Ql NAA+n-prb
- Category
- coagulation
- Sample
- stool
- Container
- Clean container
- Units
- N/A
- Ref low
- 10
- Ref high
- 40
- Critical range
- — – 5 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- non-probe-amp-tar
- CPT
- 84484
- SNOMED
- 302774002
- 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 symptoms like persistent diarrhea, abdominal pain, or weight loss, especially if you’ve traveled to areas with poor sanitation or have a weakened immune system. It’s also used to diagnose or confirm a Cryptosporidium infection in people with HIV/AIDS or other immune-compromising conditions.
What to Expect Before the Test
No special preparation is needed for this test. You’ll provide a sample of your stool in a container provided by your lab. If you’re using a stool softener or laxative, let your provider know, as it may affect the test results.
What to Expect During the Test
The test involves sending your stool sample to a lab, where it will be examined under a microscope or tested using a specialized immunofluorescent technique to detect Cryptosporidium parasites. Results are typically available within a few days.
Possible Results and Their Meanings
A positive result means Cryptosporidium parasites were found in your stool, strongly suggesting an infection. A negative result means no parasites were detected, but it doesn’t rule out other causes of your symptoms. Follow-up testing or additional questions may be needed if symptoms persist.
Reference range
Adult: 10-40 U/LN/A
No special preparation required. Avoid fatty meals before the test if possible.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Cryptosporidium infections can cause severe and prolonged diarrhea, especially in immunocompromised individuals. Early diagnosis helps manage symptoms, prevent dehydration, and guide treatment decisions. If you have HIV/AIDS or another condition weakening your immune system, prompt testing is crucial to prevent complications.
Short name
Cryptosporidium Stool Test
Frequently asked questions
How long does it take to get the results of this test?
Can I take antibiotics to treat Cryptosporidium 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