Toxoplasma gondii IgG antibody (serum/plasma)

What This Test Measures

The IgG antibody test detects the body’s immune response to *Toxoplasma gondii*. If you have antibodies, it suggests you’ve been exposed to the parasite at some point, though not necessarily currently infected. IgG antibodies typically develop weeks to months after exposure and can persist long-term.

Why It Might Be Ordered

Your healthcare provider may order this test if you have symptoms like fever, fatigue, or muscle pain, especially if you’ve recently traveled to areas with high parasite risk (e.g., undercooked meat, contaminated water) or have a weakened immune system. It’s also used in pregnancy to screen for toxoplasmosis.

What to Expect Before the Test

No special preparation is needed. A blood sample will be drawn from a vein in your arm. You may feel slight discomfort, but it’s usually over quickly. If you’re pregnant or have a condition like HIV, discuss it with your provider before testing.

What the Results Mean

Positive results indicate the presence of IgG antibodies, meaning you’ve likely been exposed to *Toxoplasma* at some time. Negative results suggest no detectable antibodies, though they don’t rule out past exposure if testing was done too soon after exposure.