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Toxoplasma gondii IgG Antibody, Serum

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

This test checks for the presence of antibodies in your blood that your immune system makes in response to the parasite Toxoplasma gondii, which can cause infections like toxoplasmosis.

Quick summary

["IgG antibodies indicate past exposure to Toxoplasma, which may or may not have caused symptoms."]

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

Key facts at a glance

LOINC
104452-8
Short code
T gondii IgG Ser Ql IB
Synonyms
T gondii IgG 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
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 of infection (such as fever, fatigue, or muscle pain), have a weakened immune system, or are pregnant to check for exposure to Toxoplasma. It can also help diagnose or monitor conditions linked to past exposure, like certain heart or eye diseases.

What to Expect Before the Test

No special preparation is needed. A blood sample is taken from a vein in your arm by a healthcare professional. You may feel slight discomfort, but it usually lasts only a few minutes.

What the Test Results Mean

Positive results suggest you’ve likely been exposed to Toxoplasma at some point. However, this does not always mean you had an active infection. Negative results mean you probably haven’t been exposed recently.

Possible Side Effects or Risks

There are generally no serious risks, but you might experience mild bruising, swelling, or pain at the injection site. Rarely, blood clots or allergic reactions can occur.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

IgG antibodies to Toxoplasma are important for diagnosing past exposure, especially in high-risk groups like pregnant individuals, transplant patients, or those with HIV/AIDS. They help guide treatment decisions and monitor chronic conditions linked to Toxoplasma infection, such as congenital toxoplasmosis or ocular toxoplasmosis.

Short name

IgG Antibody to Toxoplasma

Frequently asked questions

What does a positive IgG result mean?
A positive IgG result means your body has made antibodies against Toxoplasma gondii, indicating past exposure. This does not necessarily mean you had active symptoms or illness, but it confirms your immune system has encountered the parasite.
Can this test detect an active infection?
No, this test specifically measures IgG antibodies, which develop after an infection has resolved. To detect an active infection, your doctor may also check for IgM antibodies or other markers.
How long does it take to get results?
Results are typically available within 1 to 3 business days, depending on your lab’s processing time. Your healthcare provider will discuss the results 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