Cytomegalovirus (CMV) IgM Antibody

Tube Type

Test ID		LAB957
EPIC Order		CMV IgM
CPT Code(s)		86645
Group/Individual Test		Individual
Laboratory		Clinical Immunology
Tube Station		30
Specimen	Routine:	4 mL blood/Gold SST tube
Availability	Routine:	Monday-Friday
Turnaround Time		1-3 days
Reference Range		Negative

Comments		Specimens for CMV IgM testing are assayed with a qualitative, chemiluminescent immunoassay (CMLI) for the determination of IgM CMV antibodies in human serum. This indirect CMLI includes a step to reduce interference from IgG antibodies and rheumatoid factor. The test is intended for use as an aid in the diagnosis of acute CMV infection. However, it is not always possible to distinguish primary infection from reactivation due to the potential for IgM to be produced during reactivation. Results are expressed as Negative, Positive or Equivocal. Repeat testing on a newly collected sample should take place if an equivocal result is obtained.

Reviewed by J. Carr on November 04, 2025

UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514