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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 exposure to the infection.

Quick summary

["Past exposure to Toxoplasma may require further evaluation by your doctor."]

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

Key facts at a glance

LOINC
108775-8
Short code
T gondii IgM Msmt SerPl
Synonyms
T gondii IgM Msmt SerPl
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 Does This Test Measure?

The test detects IgG antibodies in your blood, which your immune system produces after recovering from a Toxoplasma infection. These antibodies are a sign that your body has been exposed to the parasite at some point, even if you don’t currently have symptoms.

Why Might I Need This Test?

Your healthcare provider may order this test if you have symptoms like fever, fatigue, or muscle aches, or if you have a weakened immune system (e.g., from HIV, chemotherapy, or other conditions). It can also be part of screening before certain procedures, like organ transplants.

What Does a Positive Result Mean?

A positive result suggests you’ve likely been exposed to Toxoplasma in the past, but it doesn’t always mean you’re currently infected. Some people may have lingering antibodies even after recovery.

What If My Result Is Positive?

If your result is positive, your doctor may recommend additional tests to check for active infection or assess your immune system’s health. They could also monitor you for symptoms if you’re at higher risk.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

IgG antibodies to *Toxoplasma gondii* are useful for identifying past exposure, which can help guide preventive measures for high-risk individuals (e.g., pregnant women, immunocompromised patients). However, they do not confirm active infection, which would require additional testing (e.g., IgM antibodies or parasite detection).

Short name

IgG Antibody to Toxoplasma

Frequently asked questions

Could I Have Toxoplasma Now Without Testing?
No. This test only shows past exposure. Active infection would require different tests or symptoms like severe headaches, vision changes, or flu-like illness—especially if you have a weakened immune system.
What If I’m Pregnant and Test Positive?
If you’re pregnant and test positive, your doctor will likely order further testing (like IgM) to check for active infection. If confirmed, they’ll monitor you closely and may recommend prenatal care to reduce risks to your baby.
How Can I Lower My Risk of Toxoplasma Infection?
To reduce risk, avoid raw or undercooked meat, wash fruits/vegetables thoroughly, and avoid changing litter boxes if you’re pregnant or immunocompromised. Proper handwashing is also key.
  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