Skip to content

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 after being exposed to the parasite *Toxoplasma gondii*, which can cause infections like toxoplasmosis.

Quick summary

["It helps determine if you’ve had past exposure to the parasite, which may affect your risk for certain health conditions."]

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

Key facts at a glance

LOINC
27354-0
Short code
T gondii IgE Ser Ql
Synonyms
T gondii IgE 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
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 protein your immune system makes in response to past infection by *Toxoplasma gondii*. These antibodies stay in your blood for years after recovery, helping your body remember the infection.

Why Might You Need This Test?

Your doctor may order this test if you have symptoms like fever, muscle pain, or swollen lymph nodes, or if you’ve been exposed to the parasite (e.g., handling cat litter, eating undercooked meat). It’s also used in pregnant women to check for past infection before pregnancy.

How Is the Test Done?

A blood sample is taken from a vein in your arm. The sample is sent to a lab where it’s tested for IgG antibodies using an immunoassay method.

What Are the Possible Results?

A positive result means you likely had past exposure to *Toxoplasma*. A negative result suggests you either haven’t been exposed or your body cleared the infection. Results don’t indicate whether you’re currently infected.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

IgG Antibody to Toxoplasma

Frequently asked questions

Could I have been exposed recently?
This test only shows past exposure, not current infection. If you suspect recent exposure or symptoms, your doctor may recommend additional testing.
What does a positive result mean for my health?
A positive result means you’ve likely had *Toxoplasma* before, but it doesn’t affect your current health unless you’re pregnant or have a compromised immune system. Your doctor will consider your overall health and medical history.
Do I need to do anything special before the test?
No special preparation is needed. You may have a mild reaction at the injection site, but this is normal and temporary.
  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