Toxoplasmosis IgM

This test measures IgM antibodies to Toxoplasma gondii, the organism that causes toxoplasmosis. IgM may be detected after infection, but sometimes persists for a long time or produces a nonspecific positive result. It is usually assessed alongside IgG.

When toxoplasmosis is suspected, particularly during pregnancy, confirmatory tests and assessment by a doctor are important. An early negative result does not always exclude infection; a single positive marker does not determine the risk to the fetus. If necessary, the doctor considers IgG avidity and other methods.

• Assess the antibody response to Toxoplasma gondii.
• Complement testing when clinically indicated.