Toxicity Screening for Giardia duodenalis (Antibody) – Serology
This test checks for antibodies in your blood that may indicate past or current infection with Giardia duodenalis, a microscopic parasite that can cause gastrointestinal symptoms.
["This test helps diagnose Giardia infection by detecting your immune system’s response to the parasite."]
Key facts at a glance
- LOINC
- 23784-2
- Short code
- T gondii Ab Titr Ser HA
- Synonyms
- T gondii Ab Titr Ser HA
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ha
- 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 Giardia antibodies in your serum, which your body produces in response to an infection. Antibodies are proteins that help fight off germs, and their presence suggests exposure to Giardia, though they may not always mean an active infection is ongoing.
Why It’s Ordered
Your healthcare provider may recommend this test if you have symptoms like stomach cramps, diarrhea, bloating, or nausea, especially after traveling to areas with poor sanitation or if you’ve been exposed to contaminated water.
Sample Collection and Preparation
A blood sample is drawn from a vein in your arm. The serum portion of your blood is then tested for Giardia antibodies using an immunoassay method, which identifies specific proteins your immune system makes in response to the parasite.
What to Expect Before or After the Test
No special preparation is needed for this blood test. You may experience mild discomfort from the needle, but it usually goes away quickly. If you’re pregnant, have a bleeding disorder, or take blood-thinning medications, let your provider know before the test.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance
Short name
Giardia Antibody Test
Frequently asked questions
Positive results indicate your immune system has likely encountered Giardia, but they don’t always confirm an active infection. A positive result may prompt further testing, such as a stool sample, to check for the parasite itself. Negative results mean no detectable antibodies were found, suggesting no recent exposure or infection.
How long will it take to get my results?
What does a positive result mean?
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