Serum or plasma *IgG antibody to Toxoplasma gondii (IgG)
This test measures the level of antibodies in your blood that your immune system produces in response to the parasite *Toxoplasma gondii*, which can cause infections like toxoplasmosis.
["It helps determine if you’ve been exposed to Toxoplasma and whether your immune system has developed protection against it."]
Key facts at a glance
- LOINC
- 74830-1
- Short code
- T gondii IgA Ser Ql IA
- Synonyms
- T gondii IgA Ser Ql IA
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ia
- 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
What Does This Test Measure?
The test detects IgG antibodies, which are part of your immune response. IgG antibodies typically appear after your body has encountered the parasite, usually weeks to months after exposure. This type of antibody provides long-term immunity.
Why Might You Need This Test?
Your healthcare provider may recommend this test if you have symptoms like fever, muscle aches, or fatigue that could suggest an infection, or if you have a weakened immune system (e.g., from HIV, chemotherapy, or other conditions). It’s also used in pregnant women to check for exposure before or during pregnancy.
What to Expect Before the Test
No special preparation is needed for this blood test. You may have a small needle inserted into your arm to draw a blood sample. If you’re pregnant or have a history of bleeding disorders, let your provider know before the test.
What Are Possible Results?
A positive result means you likely have IgG antibodies, indicating past exposure to Toxoplasma. A negative result suggests you may not have been exposed recently or haven’t developed these antibodies yet. Results alone don’t confirm active infection; additional testing may be needed.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
IgG antibodies to Toxoplasma are important for diagnosing past exposure and assessing immunity. In pregnant women, it helps identify potential risks to the fetus. If you’re immunocompromised, a positive result may prompt further evaluation to ensure your immune system is handling the parasite effectively.
Short name
Toxoplasma IgG Antibody
Frequently asked questions
What does a positive result mean?
Can this test detect active infection?
Is this test safe for pregnant women?
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