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Test Name

Cytomegalovirus Antibodies (IgG, IgM)

CPT Code(s)

86644, 86645

Methodology

Immunoassay (IA)

Limitations

False-positive IgM test results may be due to the presence of heterophil antibodies or presence of rheumatoid factor.

Reference Range(s)

Cytomegalovirus Antibody (IgG)

U/mL Interpretation
<0.60 Negative
0.60-0.69 Equivocal
≥0.70 Positive
A positive result indicates that the patient has antibody to CMV. It does not differentiate between an active or past infection.

 Cytomegalovirus Antibody (IgM)

AU/mL Interpretation
<30.00 No antibody detected
30.00-34.99 Equivocal
≥35.00 Antibody detected
Results from any one IgM assay should not be used as a sole determinant of a current or recent infection. Because an IgM test can yield false positive results and low level IgM antibody may persist for more than 12 months post infection, reliance on a single test result could be misleading. Acute infection is best diagnosed by demonstrating the conversion of IgG from negative to positive. If an acute infection is suspected, consider obtaining a new specimen and submit for both IgG and IgM testing in two or more weeks.

Clinical Significance

Intrauterine or congenital CMV infections occur in 0.5 to 2.2% of all live births. Symptomatic congenital infections usually occur in infants born to non-immune mothers who have primary infections during pregnancy. Latency and reactivation of CMV influence the interpretation of serological  results. A single positive CMV IgG result is and indication of present or past infection. The presence of CMV IgM suggests a recent CMV exposure but does not differentiate between primary infection and reactivation.

Alternative Name(s)

CMV Antibody IgG, IgM,CMV IgG, IgM Abs

To view specimen requirements and codes please Select a regional laboratory.

Not sure which laboratory serves your office? Call us 866-MYQUEST (866-697-8378)

Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided 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 payer being billed.

* The tests listed by specialist are a select group of tests offered. For a complete list of Quest Diagnostics tests, please refer to our Directory of Services.

6732
6732
6732
6732
6732
K91125
6732X
9928T
6732
9928T
6732X
9928T
6732
6732 CMV G M AB
6732 NTC
CMV AB
CMV G M AB
CMV IgG IgM AB
6732
6732
6732
6732
6732
6732
6732
6732X
106732
6732
6732
Cytomegalovirus Antibodies (IgG, IgM)
6732