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Toxoplasma gondii IgG antibody (serum/plasma)

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

["Determines if your body has ever encountered the toxoplasma parasite."]

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

Key facts at a glance

LOINC
33459-9
Short code
T gondii IgA Ser Ql
Synonyms
T gondii IgA Ser Ql
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

What This Test Measures

The test detects IgG antibodies, a type of immune protein your body produces in response to past infection. IgG antibodies remain in your system for years after exposure, helping your immune system remember the parasite for potential future defense.

Why It’s Ordered

Doctors may order this test if you have symptoms like fever, fatigue, or muscle pain, especially after exposure to undercooked meat, cat litter, or contaminated food. It’s also used in pregnant women to assess risk of congenital toxoplasmosis in a fetus.

When to Expect Results

Results are typically available within 3–7 business days, depending on your lab. Follow-up with your healthcare provider to discuss any findings.

What to Expect Before the Test

No special preparation is needed. You may donate blood or have a blood draw at your doctor’s office or lab. If you’re pregnant, inform your provider beforehand.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Positive IgG results suggest past infection and immunity. Negative results mean no detectable antibodies, which may indicate no prior exposure or recent infection requiring further testing (e.g., IgM). In pregnancy, positive IgG alone doesn’t confirm active infection but signals a need for monitoring or additional tests.

Short name

IgG Antibody to Toxoplasma

Frequently asked questions

How long does it take to develop antibodies after exposure?
IgG antibodies typically appear within 2–4 weeks after initial infection, though some people may take longer to develop detectable levels.
Can I get this test if I’m pregnant?
Yes, pregnant women are often tested for toxoplasma antibodies to assess risk to the fetus. Your healthcare provider will guide you on timing and follow-up.
What does a positive result mean for my health?
A positive IgG result means you’ve likely had toxoplasmosis before, and your body has developed immunity. However, you may still be at risk of reinfection, especially if you handle cat litter or eat undercooked meat. Discuss this with your doctor if symptoms arise.
  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