Toxoplasma Antibodies (IgG, IgM)

Test Code

CPT Codes
86777, 86778

Toxoplasma Antibody (IgM), Toxoplasma Antibody (IgG)

Preferred Specimen
1 mL serum

Minimum Volume
0.6 mL

Transport Container
Plastic screw-cap vial

Transport Temperature
Room temperature

Specimen Stability
Room temperature: 4 days

Refrigerated: 7 days

Frozen: 30 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis • Grossly lipemic

Immunoassay (IA)

Setup Schedule
Set up: Mon, Wed, Fri; Report available: 1-4 days

The U.S. Food and Drug Administration (FDA) is advising physicians that they should not use the result from any one Toxoplasma IgM commercial test kit as the sole determinant of recent Toxoplasma infection when screening a pregnant patient. Because these tests can have false-positive results, reliance on a single test result could lead to misdiagnosis, resulting in unnecessary treatment of the patient and/or termination of the pregnancy.

Reference Range
Toxoplasma Antibody (IgG)
IU/mL Interpretation
<7.20 Negative
7.20-8.79 Equivocal
>8.79 Positive

Toxoplasma Antibody (IgM)
AU/mL Interpretation
<8.00 Negative
8.00-9.99 Equivocal
>9.99 Positive

Clinical Significance
Toxoplasmosis is a parasitic infection caused by the protozoan Toxoplasma gondii. Approximately 23% of the immunocompetent population are asymptomatic carriers of the parasite. The combination of high titers of IgG and IgM antibodies to Toxoplasma gondii is consistent with infection in the last three months. High titers of IgG and low to medium titers of IgM antibodies to Toxoplasma gondii are consistent with infection in the last three to six months.

Performing Laboratory
Quest Diagnostics Nichols Institute
14225 Newbrook Drive
Chantilly, VA 20153

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.