Toxoplasma gondii IgG antibody in serum/plasma (qualitative)

What This Test Measures

Toxoplasma gondii is a parasite that can infect humans through contaminated food, water, or close contact with infected animals. If your body has encountered this parasite, your immune system produces antibodies, including IgG, which this test detects. A positive result suggests you’ve likely been exposed to Toxoplasma at some point, but it doesn’t always mean you’re currently infected.

Why It’s Done

Doctors may order this test if you have symptoms like fever, muscle pain, or swollen lymph nodes, especially after exposure to raw meat, undercooked food, or contact with cat litter. It’s also used to evaluate people with weakened immune systems (e.g., due to HIV or chemotherapy) who may be at higher risk for severe infections.

What to Expect

A blood sample is taken from a vein in your arm. The sample is sent to a lab where it’s tested for Toxoplasma IgG antibodies using an immunoassay method. Results are typically ready within a few days.

Interpreting Your Results

A positive result means you likely have antibodies from past exposure, but it doesn’t confirm an active infection. A negative result suggests you’ve probably never been exposed or have very low levels of antibodies.