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Toxoplasma gondii IgG and IgM Antibodies (Serum)

Published: August 9, 2026Updated: August 16, 2026

This blood test checks for antibodies against the parasite Toxoplasma gondii, which can indicate past or current infection.

Quick summary

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

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

Key facts at a glance

LOINC
5390-0
Short code
T gondii IgM Ser IA-aCnc
Synonyms
T gondii IgM Ser IA-aCnc
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

Why This Test Is Done

Doctors may order this test if you have symptoms like fever, muscle aches, or swelling, or if you’ve been exposed to toxoplasmosis (e.g., handling cat litter, eating undercooked meat). It’s also used for pregnant women to check for infection that could harm the baby.

What to Expect Before the Test

No special preparation is needed. A blood sample is taken from a vein in your arm. You may feel slight discomfort, but it’s quick and usually over in minutes.

What the Results Mean

IgG antibodies suggest past infection or immunity. IgM antibodies indicate recent infection. Both together may mean active infection. Results alone don’t diagnose toxoplasmosis without clinical signs.

Common Causes of Positive Results

Positive results can occur from exposure to Toxoplasma gondii (e.g., eating contaminated food, handling cat feces) or from shared blood products. In rare cases, false positives may occur.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Toxoplasma infection can cause serious health issues, especially in pregnant women (risk to fetus), people with weakened immune systems, or those with certain medical conditions. Early detection helps guide treatment and prevent complications.

Short name

Toxoplasma Antibody Panel

Frequently asked questions

How long does it take to get results?
Results are typically available within 3–5 business days, depending on lab processing times.
What does a positive IgG result mean?
A positive IgG result means your body has likely been exposed to Toxoplasma gondii in the past, possibly years ago, and may have developed immunity. It doesn’t confirm current infection.
Can I prevent toxoplasmosis?
Yes! Wash hands after handling cat litter, cook meat thoroughly, avoid raw or undercooked foods, and avoid gardening without gloves if you have cats.
  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