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Toxoplasma Antibodies (IgG, IgM) (TOXOGM)
Test CodeLAB2416
Quest Code
8636
Alias/See Also
TOXOGM
CPT Codes
86777,86778
Preferred Specimen
1 mL serum in gold top tube
Minimum Volume
0.6 mL
Other Acceptable Specimens
Plain red top tube
Transport Container
Transport tube
Transport Temperature
Refrigerated
Specimen Stability
Room temperature: 4 days
Refrigerated: 7 days
Frozen: 30 days
Refrigerated: 7 days
Frozen: 30 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis • Grossly lipemic
Methodology
Immunoassay (IA)
Limitations
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)
Toxoplasma Antibody (IgM)
| 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 - South Region |
