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Protozoan Parasite Ova and Cysts in Stool (Qualitative)

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

This test checks your stool for microscopic signs of protozoan parasites, which are single-celled organisms that can cause infections like giardiasis or amoebiasis.

Quick summary

["Identifying parasites in your stool helps doctors diagnose infections early and guide treatment."]

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

Key facts at a glance

LOINC
38401-6
Short code
Protozoa Spec
Synonyms
Protozoa Spec
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 Matters

Protozoan parasites can live in your digestive system and cause symptoms like stomach pain, diarrhea, or nausea. Detecting them early helps prevent complications and ensures proper treatment.

What to Expect Before the Test

You may be asked to collect a fresh stool sample in a clean container. Avoid using toilet paper or urine in the sample. Follow your healthcare provider’s instructions for proper collection.

How the Test Works

A lab technician examines your stool sample under a microscope to look for parasite eggs (ova) or their active forms (cysts). This is a qualitative test, meaning it only tells you if parasites are present, not how many.

Possible Results and Next Steps

If parasites are found, your doctor will work with you to determine the best treatment, which may include medications. If no parasites are detected, further testing or follow-up may still be needed to rule out other causes of symptoms.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Protozoan Parasites Can Cause Serious Illnesses

Short name

Stool Parasite Exam

Frequently asked questions

How often do I need this test?
This test is typically ordered if you have symptoms like persistent diarrhea, abdominal pain, or weight loss, especially if you’ve traveled to areas with higher parasite risks. Your doctor may also recommend it if you have a weakened immune system or are exposed to contaminated water.
What if I have a positive result?
A positive result means you likely have a parasite infection. Your doctor will prescribe the right medication based on the type of parasite found. Follow all treatment instructions carefully to clear the infection.
Can I eat or drink before the test?
Yes, you can eat and drink normally before the test unless your doctor advises otherwise. Avoid using any cleaning products or toilet paper in the stool sample to ensure accuracy.
  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