Toxoplasma IgM Antibody

T. gondii IgG

Result

T. gondii IgM

Result

Result Interpretation

Negative

Negative

No serologic evidence of infection with T. gondii

Negative

Equivocal

Possible early acute infection or false-positive IgM reaction. Obtain a new specimen for IgG and IgM testing. If the new specimen result remains the same, the patient is probably a false-positive.

Negative

Positive

Possible acute infection or false-positive IgM result. Obtain a new specimen for IgG and IgM testing. If results from the second specimen remain the same, the IgM reaction is probably a false-positive.

Equivocal

Negative

Equivocal: obtain a new specimen for both IgG and IgM testing.

Equivocal

Equivocal

Equivocal: obtain a new specimen for both IgG and IgM testing.

Equivocal

Positive

Possible acute infection with T.gondii. Obtain a new specimen for IgG and IgM testing. If results with the new specimen remain the same or the IgG becomes positive, both specimens should be sent to a reference laboratory with experience in the diagnosis of toxoplasmosis.

Positive

Negative

Infected with T. gondii for more than one year.

Positive

Equivocal

Infected with T. gondii for probably more than one year or false-positive IgM reaction. Obtain a new specimen for IgG and IgM testing. If results from the second specimen remain the same, both specimens should be sent to a reference laboratory with experience in the diagnosis of toxoplasmosis.

Positive

Positive

Possible recent infection within the last 12 months. Send the specimen to a reference laboratory with experience in the diagnosis of toxoplasmosis.