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Antibody to Toxoplasma gondii (IgG) - Serum

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

This test measures the level of IgG antibodies in your blood to help detect past exposure to the parasite *Toxoplasma gondii*.

Quick summary

["Past infection with *Toxoplasma* may require medical evaluation."]

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

Key facts at a glance

LOINC
35282-3
Short code
T gondii IgM SerPl Ql IF
Synonyms
T gondii IgM SerPl Ql IF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
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?

IgG antibodies are a type of immune protein your body produces after being exposed to *Toxoplasma gondii*. If present, it suggests you’ve had an infection at some point, even if you don’t currently have symptoms. This test does not check for active infection or recent exposure.

Why Might You Need This Test?

Doctors may order this test if you have a weakened immune system (e.g., due to HIV, chemotherapy, or organ transplant), symptoms like fever, fatigue, or muscle pain, or if you’ve been exposed to *Toxoplasma* (e.g., through undercooked meat or contaminated food). It helps assess risk for serious complications.

What Does a Positive Result Mean?

A positive result indicates past exposure to *Toxoplasma*, but it doesn’t confirm active infection. If you’re immunocompromised, further testing (like IgM antibodies) may be needed to check for recent infection.

What If My Results Are Abnormal?

If your results are abnormal, your healthcare provider will discuss next steps based on your medical history and symptoms. They may recommend additional tests or monitoring.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is primarily used in people with weakened immune systems to screen for past *Toxoplasma* exposure, as untreated infection can be dangerous. It’s not a routine screening test for the general population.

Short name

IgG Antibody to Toxoplasma

Frequently asked questions

Why was I asked to provide a serum sample?
Serum is the liquid part of blood after clotting, which contains antibodies. This method helps detect IgG antibodies accurately.
How long will it take to get my results?
Results are typically available within 1–3 business days, depending on lab processing times. Your doctor will contact you with the final report.
Can I take anything special before this test?
No special preparation is needed. Avoid alcohol for 24 hours before testing if instructed by your provider, as it may affect antibody detection.
  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