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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 organism.

Quick summary

["Past exposure to Toxoplasma may require medical follow-up."]

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

Key facts at a glance

LOINC
12262-2
Short code
T gondii IgM Titr Ser IA
Synonyms
T gondii IgM Titr Ser IA
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
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 an infection. IgG antibodies remain in your system for years after recovery, helping your immune system recognize and fight the parasite if it reappears. This test is used to confirm past infection rather than active illness.

Why It’s Ordered

Your healthcare provider may order this test if you have symptoms like fever, fatigue, or muscle pain, or if you’ve been exposed to Toxoplasma (e.g., handling cat litter, eating undercooked meat). It’s also used in pregnant women to screen for past infection, as Toxoplasma can pose risks to a developing fetus.

What to Expect

A small blood sample is drawn from your arm. The sample is sent to a lab where it’s tested for IgG antibodies using an immunoassay method. Results are typically ready within a few days.

What the Results Mean

A positive result means your body has likely been exposed to Toxoplasma in the past. A negative result suggests no detectable antibodies, meaning you may not have been previously exposed or the infection cleared.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

A positive IgG result alone does not indicate an active infection. However, it may prompt further testing (like IgM or PCR) if symptoms persist or if you’re at high risk (e.g., pregnant, immunocompromised). Toxoplasma can cause serious complications in certain groups, so follow-up may include monitoring or treatment recommendations.

Short name

IgG Antibody to Toxoplasma

Frequently asked questions

What does a positive result mean?
A positive result means your immune system has likely encountered Toxoplasma before, but it does not prove you’re currently infected. This test is often used to rule out past exposure rather than active illness.
Can I get this test during pregnancy?
Yes, pregnant women are often tested for Toxoplasma IgG antibodies to check for past infection. If positive, your doctor may recommend additional testing or monitoring to ensure safety for your baby.
How long do IgG antibodies last?
IgG antibodies to Toxoplasma can remain in your system for years, sometimes decades, after recovery. This is why the test is useful for screening rather than diagnosing recent or active infection.
  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