Toxoplasmosis IgG

This test measures IgG antibodies to Toxoplasma gondii, the organism that causes toxoplasmosis. IgG indicates an immune response following contact with the organism and may persist for a long time. On its own, it does not date the infection or confirm an active infection.

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.