What Is A TOXO IgG Test?
The TOXO IgG test is a blood test used to detect antibodies against Toxoplasma gondii, a parasite that causes toxoplasmosis. This infection is often asymptomatic in healthy individuals but can pose serious risks to pregnant women, newborns and immunocompromised individuals as the infection can cause serious complications in these cases including birth defects and neurological disorders. The test helps determine if a person has immunity or has a current infection.
Toxoplasmosis is commonly contracted through consuming undercooked meat, contaminated water or contact with cat feces. While most people with strong immune systems show no symptoms, the infection can lead to severe complications in vulnerable populations, such as congenital disabilities in unborn babies or life-threatening conditions in individuals with weakened immune systems. The TOXO IgG test is often recommended for pregnant women, those planning pregnancy or individuals with HIV/AIDS or other conditions affecting immunity. Early detection allows for timely management and treatment to prevent complications.
How is the Test Performed?
Sample Collection
TOXO IgG test requires a blood sample, typically from a vein in the arm of the patient.
Lab Analysis
The sample is tested for the presence of IgG antibodies specific to Toxoplasma gondii. IgG antibodies typically appear several weeks after initial infection and remain detectable for life indicating past exposure. The test is performed using techniques like enzyme-linked immunosorbent assay (ELISA) or chemiluminescent immunoassay (CLIA), which are highly accurate and reliable.
Turnaround Time
Results are normally available in 24 -48 hours.
What are the symptoms that prompt this test?
The TOXO IgG test is recommended if symptoms of the parasite are present or as a screening tool in high risk individuals.
Adults/Children
- Flu like symptoms (fever, fatigue, muscle aches)
- Swollen lymph nodes
- Headaches
- Blurred vision or eye pain (in cases of ocular toxoplasmosis)
- Developmental delays (in children)
- Neurological symptoms (seizures, confusion)
High Risk Individuals
- Pregnant women, although no symptoms but tested to rule out infection that could harm the fetus.
- People consuming undercooked meat
- Individuals with exposure to cats
- Immunocompromised individuals (HIV/AIDS patients etc.)
What are Normal Ranges for This Test?
The TOXO IgG test results are reported as positive or negative:
- Negative Result –No IgG antibodies detected, indicating no past or current infection.
- Positive Result –IgG antibodies detected, suggesting past or current infection.
The presence of IgG antibodies indicates exposure regardless of gender.
** Normal levels are dependent on a number of factors including age, gender, testing method and health condition of patient etc. Result interpretation should be done by a qualified doctor or healthcare professional.**
What Happens if Test Results Show Abnormal Levels?
If TOXO IgG test is positive, further testing is required to determine if there is an active infection. A TOXO IgM test is often performed alongside IgG to assess acute infection.
- For Pregnant Women – If acute infection is confirmed, treatment with antibiotics is recommended to reduce the risk of transmission to the fetus. Regular monitoring and ultrasounds may also be advised.
- For Immunocompromised Individuals –Anti-parasitic medications may be prescribed to manage the infection.
- For Others –No treatment is usually needed if the infection is asymptomatic and past.
The doctor will tailor the next steps based on the patient’s health status and symptoms.
