Toxoplasma gondii IgG Antibody, Serum

What This Test Measures

The test detects IgG antibodies against Toxoplasma gondii, a parasite that can affect the brain, eyes, and other organs. These antibodies are produced by your immune system in response to an infection. IgG antibodies typically remain in your bloodstream for years after recovery, helping your body remember the infection for future protection.

Why It’s Ordered

Your healthcare provider may order this test if you have symptoms like fever, fatigue, muscle pain, or swelling in your lymph nodes. It’s also used before pregnancy to check for past exposure, especially if you’re at higher risk of complications from Toxoplasma. Doctors may also recommend it for people with weakened immune systems or certain medical conditions.

What to Expect Before the Test

No special preparation is needed for this blood test. You may have a small needle inserted into your arm to draw a blood sample. The process usually takes a few minutes, and you can resume normal activities afterward.

What the Results Mean

A positive result means you likely had Toxoplasma infection at some point, even if you don’t currently have symptoms. A negative result suggests you haven’t been exposed recently or at all. Results don’t indicate whether you’re currently infected or if symptoms will develop later.