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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 infection. Antibodies help your immune system fight off the parasite.

Quick summary

["This test helps determine if you’ve been exposed to Toxoplasma, a parasite that can affect the brain or other organs."]

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

Key facts at a glance

LOINC
100115-5
Short code
T gondii 31kD Ab Ser Ql IB
Synonyms
T gondii 31kD Ab Ser Ql IB
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ib
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, a type of immune protein your body produces after exposure to *Toxoplasma gondii*. These antibodies stay in your system for years, even after the infection has cleared. This test is not used to diagnose an active infection but to check for prior exposure.

Why Might You Need This Test?

Your healthcare provider may order this test if you have symptoms like fatigue, fever, or muscle pain that could suggest past infection. It’s also used in certain groups, such as pregnant women, immunocompromised individuals, or those with autoimmune diseases, to assess exposure risk.

How Is the Test Performed?

A blood sample is taken from a vein in your arm. The sample is sent to a lab for testing using an immunoassay method to detect IgG antibodies.

What Are Possible Results?

A positive result means your body has produced IgG antibodies, suggesting past exposure to *Toxoplasma*. A negative result means no detectable antibodies were found, indicating no prior exposure or very recent infection.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

IgG Antibody to Toxoplasma

Frequently asked questions

What does a positive result mean?
A positive result means your body has likely been exposed to *Toxoplasma* at some point, but you may not currently have an active infection. This is common in people who have had the parasite for years.
Does this test show if I have an active infection?
No, this test only detects IgG antibodies, which indicate past exposure. For an active infection, other tests (like PCR or antibody tests for IgM) would be needed.
Can I get this test during pregnancy?
Yes, pregnant women may be tested for Toxoplasma antibodies to assess risk of congenital infection. Your doctor will discuss results and next steps with you.
  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