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Toxoplasma gondii IgG antibody (serum/plasma)

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

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

Quick summary

["It helps determine if you’ve been exposed to the parasite and whether your body has built immunity."]

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

Key facts at a glance

LOINC
100116-3
Short code
T gondii 33kD Ab Ser Ql IB
Synonyms
T gondii 33kD Ab 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
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, which are part of your immune system’s long-term response to *Toxoplasma gondii*. These antibodies stay in your blood after an initial infection has cleared, indicating past exposure. The presence of these antibodies suggests your body has developed immunity to the parasite.

Why It’s Done

Doctors may order this test if you have symptoms like fever, fatigue, or muscle aches that could be linked to a past *Toxoplasma* infection. It’s also used in pregnant women to check for immunity before pregnancy, as toxoplasmosis can pose risks to a developing fetus.

When to Expect Results

Results are typically ready within 2–5 business days after your blood sample is drawn. Your healthcare provider will discuss the meaning of your results with you.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into your arm to draw a blood sample. If you’re pregnant or have a weakened immune system, let your doctor know before the test.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

IgG Antibody to Toxoplasma

Frequently asked questions

How long does it take to develop immunity after exposure?
Immunity from *Toxoplasma* infection usually develops within weeks to months after exposure, but it can take longer for antibodies to appear in your blood. Your body’s immune response varies, so results may take time to confirm.
Can I get this test if I’m not pregnant?
Yes, this test is available for anyone. It’s most commonly ordered for pregnant women to assess immunity, but it can also be used for general health screening or to investigate symptoms.
What if my test results are negative but I suspect I’ve been exposed?
A negative IgG result doesn’t always mean you’ve never been exposed. Some people may not develop detectable antibodies, or the test may need to be repeated after a longer wait. If you suspect exposure, discuss it with your doctor for further evaluation.
  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