Test Overview
Test Methodology

Chemiluminescent Immunoassay

Test Usage

Support the diagnosis of acute Cytomegalovirus infection. The presence of IgG antibody generally indicates past exposure and immunity. The presence of IgM antibody indicates recent infection. Elevated levels 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 CMV. EQUIVOCAL: Presence or absence of IgM antibody to CMV cannot be determined. Another specimen should be sent for analysis. POSITIVE: Indicates detectable levels of IgM antibody to CMV. Detectable levels of CMV 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. The performance characteristics of this test have not been established for CSF, neonates, infants, cord blood, or pre-transplant patients.

Test Details
Days Set Up
Monday - Friday
Analytic Time

8 hours

Soft Order Code
MiChart Code
CMV IgM Antibody Titer
  • CMVM
  • CMV Antibody IgM
  • CMV IGM Antibody
  • CMV Serology
  • Cytomegalovirus, IgM
  • Cytomegalovirus IgM, Qual
  • Viral Antibody: Cytomegalovirus IgM
  • Torch Screen
Chemical Pathology
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.

Normal Volume
1 mL serum
Minimum Volume
0.3 mL serum
Additional Information

The assay is reported as either positive or negative because the magnitude of the IgM level cannot be correlated to the amount of antibody present.

CPT Code
Fee Code