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Cryptosporidium Parasite Detection (Qualitative, Stool Sample)

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

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

Quick summary

["A positive result may indicate infection that requires medical evaluation or treatment."]

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

Key facts at a glance

LOINC
20997-3
Short code
Deprecated Cryptosporidium
Synonyms
Deprecated Cryptosporidium
Category
coagulation
Sample
serum
Container
Red-top tube (SST)
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
Method
immunofluorescence
CPT
85610
SNOMED
396252006
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

What This Test Measures

The test detects genetic material (DNA) from *Cryptosporidium* parasites found in your stool. This helps confirm if you have an active infection caused by this parasite.

Why It’s Done

Doctors may order this test if you have persistent diarrhea, especially after traveling to areas with poor sanitation, or if you have a weakened immune system (e.g., from HIV/AIDS, chemotherapy, or other conditions).

How the Test Works

A sample of your stool is collected and analyzed using a molecular method (e.g., polymerase chain reaction, PCR) to identify parasite DNA. This is highly sensitive and can detect even small amounts of infection.

What to Expect

No special preparation is needed. Bring a fresh stool sample to your appointment. Results may take a few days to a week, depending on lab processes.

Reference range

INR: 0.8-1.2 (warfarin: 2.0-3.0)N/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.

Clinical Significance

Short name

Crypto Stool Test

Frequently asked questions

A positive result suggests an active *Cryptosporidium* infection, which can cause severe dehydration and malnutrition, particularly in vulnerable groups. Treatment focuses on supportive care (e.g., fluids, pain relief) and may include antiparasitic medications in some cases.
This test is not used to diagnose other causes of diarrhea (e.g., viruses, bacteria). If symptoms persist, further testing may be needed.
How long does it take to get results?
Results typically arrive within 3–7 business days, depending on lab workload. Your healthcare provider will discuss the outcome with you.
Can I eat or drink before the test?
No special diet is required. Bring a fresh stool sample—avoid using toilet paper or medications that may alter the sample.
  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