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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.

Quick summary

["Your body’s immune response to a past Toxoplasma infection may be detected here."]

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

Key facts at a glance

LOINC
111296-0
Short code
T gondii Ab Msmt Ser
Synonyms
T gondii Ab Msmt Ser
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

Why This Test Is Done

Doctors may order this test if you have symptoms like fever, fatigue, or muscle pain that could be linked to a Toxoplasma infection. It’s also used in pregnant women to check for exposure, as Toxoplasma can affect fetal development. Additionally, people with weakened immune systems may need this test to monitor for infections that could be dangerous.

What to Expect Before the Test

No special preparation is needed. A blood sample will be drawn from a vein in your arm by a healthcare professional. You may feel a slight pinch, but it usually doesn’t cause significant discomfort.

What the Test Results Mean

Positive results suggest you’ve had exposure to Toxoplasma at some point, meaning your immune system has produced antibodies against the parasite. Negative results indicate no detectable antibodies, meaning either you’ve never been exposed or the infection has cleared.

Possible Side Effects

There are usually no serious side effects from a blood draw. You might experience mild bruising, swelling, or soreness at the injection site, which typically goes away within a few days.

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 produced antibodies against Toxoplasma, indicating past exposure. This doesn’t necessarily mean you’re currently infected, but it confirms your immune system has encountered the parasite.
Can this test detect an active infection?
This test primarily detects antibodies, which indicate past exposure rather than an active infection. For active infection, additional tests or clinical symptoms would be considered.
Is this test safe for pregnant women?
Yes, this blood test is safe for pregnant women. It helps monitor Toxoplasma exposure, which can be harmful to a developing fetus. Always follow your healthcare provider’s guidance for interpretation and next steps.
  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