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Cytomegalovirus Antibody, IgG
Ordering Recommendation
Detect past cytomegalovirus exposure. Not recommended for diagnosis in immunocompromised individuals.
New York DOH Approval Status
Specimen Required
Serum Separator Tube (SST).
Allow specimen to clot completely at room temperature. Separate from cells ASAP or within 2 hours of collection. Transfer 1 mL serum to an ARUP Standard Transport Tube. (Min: 0.5 mL) Parallel testing is preferred and convalescent specimens must be received within 30 days from receipt of the acute specimens.
Refrigerated.
Contaminated, heat-inactivated, or grossly hemolyzed specimens.
Label specimens plainly as "acute" or "convalescent."
After separation from cells: Ambient: 48 hours; Refrigerated: 2 weeks; Frozen: 1 year (Avoid repeated freeze/thaw cycles)
Methodology
Semi-Quantitative Chemiluminescent Immunoassay
Performed
Sun-Sat
Reported
Within 24 hours
Reference Interval
| 0.59 U/mL or less: | Not Detected. |
| 0.60-0.69 U/mL: | Indeterminate - Repeat testing in 10-14 days may be helpful. |
| 0.70 U/mL or greater: | Detected. |
Interpretive Data
In immunocompromised patients, CMV serology (IgG or IgM antibody titers) may not be reliable and may be misleading in the diagnosis of acute or reactivation CMV disease. The preferred method for diagnosis is culture of virus and/or demonstration of viral antigen in peripheral white cells (buffy coat), bronchoalveolar lavage (BAL) cells, or tissue biopsies.
This test should not be used for blood donor screening, associated re-entry protocols, or for screening Human Cell, Tissues and Cellular and Tissue-Based Products (HCT/P).
The best evidence for current infection is a significant change on two appropriately timed specimens, where both tests are done in the same laboratory at the same time.
FDA
Note
Hotline History
CPT Codes
86644
Components
| Component Test Code* | Component Chart Name | LOINC |
|---|---|---|
| 0050165 | CMV Antibody IgG | 5124-3 |
Aliases
- CMV Ab, Quantitative
- CMV Antibody
- CMV IgG
