Serum/plasma concentration of Toxoplasma gondii immunoglobulin G (IgG) antibodies

Why This Test Is Done

Doctors may order this test if you have symptoms like fever, muscle aches, or neurological issues (such as headaches, confusion, or seizures) that could be linked to a Toxoplasma infection. It’s also used in pregnant women to check for exposure before or during pregnancy, as Toxoplasma can pose risks to a developing fetus. Additionally, it may be part of monitoring for people with weakened immune systems, such as those with HIV/AIDS or undergoing certain treatments.

What to Expect Before the Test

No special preparation is needed for this test. A blood sample will be drawn from a vein, typically in your arm. You may feel a slight pinch, but it usually takes only a few minutes. If you’re pregnant or have a history of bleeding disorders, let your healthcare provider know before the test.

What the Results Mean

Positive results indicate you’ve likely been exposed to Toxoplasma in the past and your body has produced IgG antibodies to fight it. These antibodies stay in your blood for years, meaning a positive test suggests past infection. Negative results mean you either haven’t been exposed or your body hasn’t yet produced detectable antibodies.

Possible Side Effects or Risks

There are generally no serious risks from a blood draw, though you might experience mild bruising, soreness, or swelling at the injection site. Rarely, a reaction to the needle or blood draw process could occur, such as fainting or a slight allergic reaction.