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Toxoplasma gondii IgG Antibody (Serum)

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

This test checks for antibodies in your blood that your immune system produces in response to a parasite called *Toxoplasma gondii*. Antibodies indicate past or current exposure to this parasite.

Quick summary

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

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

Key facts at a glance

LOINC
111438-8
Short code
T gondii IgG Msmt Ser
Synonyms
T gondii IgG Msmt Ser
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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

Why This Test Is Done

Doctors may order this test if you have symptoms like fever, fatigue, or muscle pain that could be linked to an infection. It’s also used during pregnancy to check for exposure, as Toxoplasma can pose risks to a developing fetus. Additionally, people with weakened immune systems may need this test to monitor for infections.

What the Test Measures

The test detects IgG antibodies, which your body makes after recovering from or being exposed to Toxoplasma. These antibodies stay in your blood for a long time, helping your immune system remember the parasite.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm to draw blood. The process takes a few minutes, and you may feel a brief pinch. If you’re pregnant, let your doctor know before the test.

What the Results Mean

A positive result means you likely had exposure to Toxoplasma at some point. A negative result suggests you haven’t been exposed recently, but it doesn’t rule out past exposure. Results are interpreted by your healthcare provider based on your symptoms and medical history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

IgG Antibody to Toxoplasma

Frequently asked questions

What Does It Tell You About My Health?
A positive IgG result may indicate past infection, which is usually harmless but can sometimes cause complications, especially in people with weakened immune systems or pregnant women. It’s important for monitoring high-risk groups, like those with HIV/AIDS or undergoing chemotherapy, to prevent severe infections.
How Does This Test Help My Doctor?
Your doctor uses this test to guide treatment decisions, especially in pregnancy or for people with immune conditions. If you’re pregnant, a positive result may prompt further testing to check for Toxoplasma in your baby or additional precautions.
What If My Results Are Abnormal?
If your results are positive, your doctor may recommend additional tests, like IgM antibodies, to confirm the timing of exposure. If you’re pregnant, they may suggest extra prenatal care or monitoring. Follow-up testing can help track your immune response or rule out other conditions.
  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