To detect a Toxoplasma gondii infection in a pregnant woman, unborn baby, or in a person with a weakened immune system (immunocompromised) who has flu-like symptoms; sometimes to determine if a person has been previously infected or to help determine if complications are due to an active Toxoplasma infection.
When a pregnant woman or a person with a weakened immune system has been exposed to T. gondii and/or has flu-like symptoms or a severe eye or brain infection that a doctor suspects are due to toxoplasmosis and then the test is required.
IgM: Negative
IgG: Positive
Possible Interpretation: Past infection.
IgM: Negative
IgG: Negative
Possible Interpretation: No infection or very early infection; no previous exposure.
IgM: Positive
IgG: Negative
Possible Interpretation: Early infection; in a newborn, indicates congenital infection.
IgM: Positive
IgG: Positive
Possible Interpretation: Current infection; chronic infection; could indicate re-activation; IgM may be positive for several months after the infection resolves.
