T. gondii IgG Antibody (Serum) - Qualitative
This test checks for antibodies to the parasite *Toxoplasma gondii*, which can indicate past or current infection.
["Past exposure to toxoplasmosis may be detected with this simple blood test."]
Key facts at a glance
- LOINC
- 49109-2
- Short code
- T gondii Ab CSF IA-aCnc
- Synonyms
- T gondii Ab CSF IA-aCnc
- Category
- chemistry
- Sample
- csf
- Container
- Sterile tube
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ia
- Specimen volume
- 1-2 mL
- Stability
- Immediate analysis required, Refrigerated: 1h
- Hemolysis max
- 200
- TAT
- 4–24 hours
- Order
- routine
What Does This Test Measure?
The test detects IgG antibodies against *Toxoplasma gondii*, a parasite that can affect the immune system. IgG antibodies typically develop after an initial infection and remain in the blood for years. This test is qualitative, meaning it only tells you if antibodies are present, not their exact level.
Why Might You Need This Test?
You may have this test if you have symptoms like fever, fatigue, or muscle pain that could be linked to toxoplasmosis, especially if you’ve recently traveled to areas with high parasite exposure or have weakened immunity (e.g., from HIV, chemotherapy, or organ transplant). It’s also used to screen pregnant women to check for toxoplasmosis exposure.
What Does a Positive Result Mean?
A positive result suggests you’ve likely been exposed to *Toxoplasma gondii* at some point, meaning your body has produced antibodies to fight it. This doesn’t always mean you’re currently sick, but it indicates past infection. Further testing may be needed to assess active infection or immunity.
What Does a Negative Result Mean?
A negative result means no detectable IgG antibodies were found in your blood. This could mean you’ve never been exposed to the parasite, but it doesn’t rule out recent exposure if testing was done too soon after infection.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test is critical for identifying past exposure in high-risk groups (e.g., pregnant individuals, immunocompromised patients) to guide preventive measures or monitor for complications. While IgG alone doesn’t confirm active infection, it helps clinicians assess exposure history and tailor follow-up care. False negatives can occur if testing is done too early after exposure, so repeat testing may be needed.
Short name
T. gondii IgG Antibody (Serum)
Frequently asked questions
Could I have toxoplasmosis without this test showing antibodies?
Does this test show if I’m currently sick with toxoplasmosis?
How soon after exposure might I get a positive result?
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