Giardia lamblia Antigen in Stool (Qualitative)
This test detects the presence of *Giardia lamblia*, a microscopic parasite that can cause intestinal infections, often leading to diarrhea, stomach cramps, or bloating. It helps identify if you’ve been exposed to this parasite.
["A simple stool test to check for a common parasite causing digestive symptoms."]
Key facts at a glance
- LOINC
- 9658-6
- Short code
- G lamblia IgA Ser-aCnc
- Synonyms
- G lamblia IgA Ser-aCnc
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 82784
- 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
Giardia is a common parasite found in contaminated water or food. It can spread in places with poor sanitation, like daycare centers, camps, or after travel to areas with unsafe water sources. This test helps doctors diagnose infections early to prevent ongoing discomfort or complications like malnutrition in children.
How the Test Works
The test looks for specific proteins (antigens) produced by *Giardia lamblia* in your stool. If these proteins are found, it suggests you’re infected. The result is either positive (infection present) or negative (no infection detected).
What to Expect Before the Test
No special preparation is needed. You’ll provide a single stool sample in a provided container. If you’re using a home test kit, follow the instructions carefully. If done in a lab, a healthcare provider will collect the sample for you.
What the Results Mean
A **positive result** means the test found evidence of *Giardia lamblia* in your stool, indicating an active infection. A **negative result** means no parasite was detected at the time of testing, but you may still need further testing if symptoms persist. Follow-up may include retesting or additional tests if needed.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
Giardia stool test (qualitative)
Frequently asked questions
What symptoms might this test be used for?
How long does it take to get results?
Can I have this test if I’m pregnant?
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