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Cryptosporidium Lateral Flow Test for Stool (Qualitative)

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

This test checks for the presence of *Cryptosporidium*, a microscopic parasite that can cause gastrointestinal illness, often in people with weakened immune systems.

Quick summary

["A positive result may indicate infection; a negative result does not rule out infection, especially if symptoms persist."]

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

Key facts at a glance

LOINC
98411-2
Short code
Cryptosp Islt RFLP.rRNA
Synonyms
Cryptosp Islt RFLP.rRNA
Category
coagulation
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
136
Ref high
145
Critical range
120 N/A – 160 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
rflp-rrna
CPT
84295
SNOMED
110741000
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

Why This Test Is Done

Your doctor may order this test if you have symptoms like diarrhea that last for more than a few days, especially if you’ve traveled to areas with poor sanitation or have a weakened immune system. It’s also used in monitoring people with HIV/AIDS, organ transplant recipients, or those with other immune disorders.

How the Test Works

A small sample of your stool is tested using a rapid lateral flow device. This detects the parasite’s DNA if present, providing results in about 15–30 minutes. The test is qualitative, meaning it only tells whether the parasite is likely present or not.

Sample Collection

You’ll need to collect a fresh stool sample (preferably within 24 hours) in a provided container. Avoid using toilet paper or cleaning products in the sample. Bring the container to your doctor’s office or lab immediately.

What to Expect After Testing

Results are typically available the same day or within a few days. If you’re tested at a clinic, you may receive results on the spot. If not, your doctor will discuss them with you during a follow-up visit.

Reference range

Adult: 136-145 mmol/LN/A

Specimen: serum

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.

◆Associated findings1

Short name

Cryptosporidium Stool Test

Frequently asked questions

What does a positive result mean?
A positive result strongly suggests you have an active *Cryptosporidium* infection. Your doctor may recommend further testing or monitoring, especially if you have a weakened immune system. Follow-up may include stool samples for culture or additional blood tests to assess overall health.
What if I get a negative result but still have symptoms?
A negative result means the test did not detect the parasite at the time of testing. However, symptoms can sometimes persist for weeks or months. If your diarrhea continues, consult your doctor to explore other causes or retest if symptoms worsen.
How can I prevent *Cryptosporidium* infection?
To lower your risk, practice good hygiene: wash hands thoroughly after using the toilet and before handling food. Avoid swimming in contaminated water, and do not prepare food if you’re ill. If visiting areas with poor sanitation, take extra precautions, like drinking bottled water.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

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