Antibody to Toxoplasma gondii (IgG)
This test measures the level of Immunoglobulin G (IgG) antibodies against the parasite Toxoplasma gondii in your blood. IgG antibodies indicate past or current infection with Toxoplasma.
["IgG antibodies to Toxoplasma help determine if you’ve been exposed to the parasite."]
Key facts at a glance
- LOINC
- 31178-7
- Short code
- T gondii IgM CSF IA-aCnc
- Synonyms
- T gondii IgM 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
- CPT
- 82784
- Specimen volume
- 1-2 mL
- Stability
- Immediate analysis required, Refrigerated: 1h
- Hemolysis max
- 200
- TAT
- 4–24 hours
- Order
- routine
What This Test Measures
IgG antibodies are a type of immune protein your body produces in response to an infection. If you have these antibodies, it suggests your immune system has encountered Toxoplasma gondii, the parasite responsible for toxoplasmosis. This test helps identify whether you’ve had exposure, even if symptoms were mild or absent.
Why It’s Done
Doctors may order this test if you have symptoms like fever, fatigue, or muscle pain that could be linked to toxoplasmosis. It’s also used in pregnancy to check for exposure, as toxoplasmosis can pose risks to an unborn baby. Additionally, it may be part of screening for people with weakened immune systems, such as those with HIV/AIDS or undergoing chemotherapy.
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. The process is quick and usually painless. If you’re pregnant or have a history of bleeding disorders, let your healthcare provider know before the test.
What to Expect During the Test
The blood sample will be sent to a lab for analysis. The test involves detecting IgG antibodies using an immunoassay method. Results are typically available within a few days, depending on lab processing times.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Positive results indicate exposure to Toxoplasma gondii, meaning your body has produced antibodies to fight the parasite. This can be useful for diagnosing past infection, assessing risk in pregnancy, or monitoring immune status in vulnerable individuals. However, a single positive test does not confirm active infection without additional testing. Negative results suggest no recent exposure, but repeated testing may be needed if symptoms persist or if further evaluation is required.
Short name
IgG Anti-Toxoplasma
Frequently asked questions
How long does it take to get the results of this test?
Can I drink or eat before this test?
What does a positive result mean for my health?
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