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Serum IgG Anti-Toxoplasma IgG Antibody (Qualitative)

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

This test checks for antibodies to the parasite *Toxoplasma gondii*, which can indicate past or current infection by this organism.

Quick summary

["This test helps determine if you’ve been exposed to toxoplasmosis, a parasite that can affect the immune system and sometimes the eyes or brain."]

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

Key facts at a glance

LOINC
74847-5
Short code
T gondii IgE Ser Ql IA
Synonyms
T gondii IgE Ser Ql 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
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 Might Be Ordered

Your doctor may recommend this test if you have symptoms like fever, fatigue, or muscle aches that could be linked to toxoplasmosis, especially if you have a weakened immune system. It may also be used before certain surgeries or procedures to assess immune status. Rarely, it’s checked in pregnancy to evaluate risk to the fetus.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample from a vein in your arm. The test is typically done in a lab and results are qualitative (yes/no) rather than a numeric value.

What the Results Mean

A positive result means your body has produced antibodies against *Toxoplasma gondii*, suggesting past exposure. A negative result means no detectable antibodies were found, indicating either no prior exposure or recent infection that hasn’t yet developed antibodies.

Common Reasons for Testing

This test is most relevant for people with weakened immune systems (e.g., due to HIV/AIDS, chemotherapy, or organ transplant), pregnant individuals, or those with symptoms that could suggest toxoplasmosis. It’s not a routine screening test for the general public.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

IgG Anti-Toxoplasma Antibody (Qualitative)

Frequently asked questions

What does a positive result mean?
A positive result indicates past infection with *Toxoplasma gondii*. While this doesn’t always cause illness, it can be concerning if you have a compromised immune system, as toxoplasmosis can cause severe complications. Pregnant women with a positive result may need further evaluation to assess risk to the fetus.
What does a negative result mean?
A negative result means no antibodies were detected, which could mean you’ve never been exposed to the parasite or that your immune system hasn’t yet produced detectable antibodies (e.g., in very early infection). It doesn’t rule out infection entirely, especially if symptoms are present.
How often should I get this test?
This test is usually done once, unless your doctor has specific reasons to monitor exposure (e.g., before a transplant or during pregnancy). Follow-up testing depends on your medical situation and symptoms.
  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