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Giardia parasite stool antigen detection (qualitative)

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

This test checks for the presence of Giardia parasite DNA in your stool, helping identify infections caused by this common intestinal parasite.

Quick summary

["Looks for Giardia parasite in stool to diagnose infections."]

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

Key facts at a glance

LOINC
97522-7
Short code
Giardia Wat Ql IF
Synonyms
Giardia Wat Ql IF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
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 recommend this test if you have symptoms like stomach pain, diarrhea, bloating, or gas—especially if you’ve traveled to areas with poor sanitation or had recent exposure to contaminated water. It’s also used to confirm a suspected Giardia infection after other tests or if symptoms persist despite treatment.

How the Test Works

A small sample of your stool is collected and tested for Giardia parasite genetic material using a molecular method. This helps detect the parasite even when symptoms are mild or absent.

Sample Collection

You’ll need to provide a fresh stool sample (usually collected in a special container) on the day of testing. Follow your healthcare provider’s instructions for proper collection to ensure accurate results.

What to Expect

The test is quick and painless. The lab processes the sample within hours, and results are typically ready within a few days. If positive, further testing or treatment may be recommended.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Giardia stool test

Frequently asked questions

How long does it take to get results?
Results are usually available within 2–5 business days, depending on lab processing times. Your doctor will discuss the results with you during your follow-up visit.
Can I eat or drink before the test?
You may eat and drink normally before the test, but avoid laxatives or stool softeners unless instructed otherwise by your doctor. Fresh stool is most reliable for accurate results.
What if my test is negative but I still have symptoms?
A negative result doesn’t always mean you’re clear of Giardia. Other causes of symptoms may be present, or the infection could be in an early or hard-to-detect stage. Follow-up testing or additional evaluation may be needed if symptoms continue.
  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