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Toxoplasma gondii IgG antibody (Serum) – Immunoassay

Published: August 9, 2026Updated: August 16, 2026

This test checks for antibodies to the parasite *Toxoplasma gondii*, which can indicate past or current exposure to toxoplasmosis, a condition caused by the parasite.

Quick summary

["This test helps determine if you’ve been exposed to toxoplasmosis, which can affect immune health or pregnancy."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
86737-4
Short code
T gondii Ag Tiss Ql ImStn
Synonyms
T gondii Ag Tiss Ql ImStn
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
immune-stain
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 Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like fever, fatigue, or muscle pain, or if you have a weakened immune system (e.g., due to HIV, chemotherapy, or organ transplant). It’s also checked during pregnancy to assess risk to the fetus.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from your arm. The test is quick and typically done in a lab setting.

What the Results Mean

Positive results suggest you’ve had past exposure to *Toxoplasma gondii*. Negative results mean you likely haven’t been exposed recently, but past infection may still be present (detected by other tests like IgM).

Common Reasons for Testing

This test is often used to screen for chronic toxoplasmosis in people with immune disorders or to monitor pregnant women for congenital risks.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Toxoplasmosis can cause mild flu-like symptoms or serious complications in people with weakened immune systems. In pregnancy, it may lead to birth defects if the infection is acquired during gestation. This test helps guide treatment or preventive measures.

Short name

IgG Antibody to Toxoplasma

Frequently asked questions

What does a positive result mean?
A positive IgG result means your body has produced antibodies against *Toxoplasma gondii*, indicating past exposure. This doesn’t always mean you’re currently infected, but it suggests your immune system has encountered the parasite before.
Can I get this test at home?
No, this test requires a blood sample collected by a healthcare professional in a clinical setting.
How long does it take to get results?
Results are usually available within 1–3 business days, depending on your lab’s processing time.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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