Laboratory Services

Toxoplasma gondii Antibody, IgG, Serum

Print this page

Updated Test Information:

Test Description
Toxoplasma gondii Antibody, IgG, Serum

T. gondii; Toxoplasma gondii; Toxoplasmosis; Toxoplasma IgG

Test ID
General Information

Useful for:

  • Determining whether a patient has had previous exposure to or recent infection with Toxoplasma gondii

  • This test is not useful for diagnosing infection in infants younger than 6 months of age

    • In that age group, IgG antibodies usually are the result of passive transfer from the mother.

Specimen Type


Specimen Requirements

  • Preferred: Serum Gel (SST)

  • Acceptable: Red Top


  • Refrigerated (preferred): 14 days

  • Frozen: 14 days

Unacceptable Specimen Conditions

  • Gross hemolysis

  • Gross lipemia

  • Gross icterus

  • Heat-inactivated specimen


  • Sera drawn very early during the acute stage of infection may have Toxoplasma IgG levels below 9 IU/mL

  • The Toxoplasma IgG assay should not be used alone to diagnose recent Toxoplasma gondii infection. Results should be considered in conjunction with clinical presentation, patient history, and other laboratory findings

  • The performance characteristics of this assay have not been evaluated in immunocompromised individuals and have not been established for cord blood or for testing of neonates


Multiplex Flow Immunoassay (MFI)

Estimated TAT

1-3 days

Testing Schedule



14 days

CPT Code(s)


Additional Information
Minimum Sample Volume

0.4 mL

Reference Range

≤ 9 IU/mL (Negative)

Performing Lab


LOINC Code(s)

40677-7, 8039-0