Test Overview
Test Methodology

Chemiluminescent Immunoassay

Test Usage

Support the diagnosis of acute Toxoplasma infection. The presence of IgG antibody generally indicates past exposure and immunity. The presence of IgM antibody indicates recent infection. Elevated responses in neonates should be followed up with studies to rule out the presence of maternal antibodies, either by obtaining a convalescent specimen or by the demonstration of the absence of an IgM response.

Reference Range *

NEGATIVE: Indicates no detectable IgM antibody to Toxoplasma. EQUIVOCAL: Presence or absence of IgM antibody to Toxoplasma cannot be determined. Another specimen should be sent for analysis. POSITIVE: Indicates detectable levels of IgM antibody to Toxoplasma. Detectable levels of Toxoplasma IgM antibody support the diagnosis of an acute primary or recurring latent infection.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Limitations

Antibody result values from different test methods and/or from different institutions cannot be compared quantitatively. Positive Toxoplasma gondii IgM results should be interpreted with caution, especially if the IgG result is negative. False positive results are possible.

Test Details
Days Set Up
Monday - Friday
Analytic Time

8 hours

Soft Order Code
TOXM
MiChart Code
Toxoplasma gondii Antibody, IgM
Synonyms
  • TOXO IGM ANTIBODY
  • Toxoplasma gondii IgM
  • Viral Antibody: Toxoplasma IgM
  • TOXOMT
  • TOXOM
  • TOXOPLASMA IGM ANTIBODY, SERUM
  • TOXM
  • Toxoplasma IgM, Qualitative
  • Torch Screen
Laboratory
Chemical Pathology
Section
Special Chemistry
Specimen Requirements
Collection Instructions

Collect specimen in an SST (preferred) or red top tube. Centrifuge, aliquot serum into a plastic vial and refrigerate.

Yellow Top Tube
Normal Volume
1 mL serum
Minimum Volume
0.3 mL serum
Additional Information

The magnitude of the measured result is not indicative of the amount of antibody present.

Billing
CPT Code
86778
Fee Code
37956
LOINC
40678-5
Resources