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Cytomegalovirus Antibody, Serum or Plasma (IgG and IgM)

Published: August 9, 2026Updated: August 16, 2026

This test checks for antibodies against cytomegalovirus (CMV), a common virus that can affect people of all ages. Antibodies indicate whether your body has ever been exposed to CMV or is actively responding to it.

Quick summary

["CMV antibodies help determine past or current infection risk."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
5122-7
Short code
CMV Ab SerPl IF-aCnc
Synonyms
CMV Ab SerPl IF-aCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Is Done

Doctors may order this test to evaluate exposure to CMV, especially in high-risk groups like pregnant women, organ transplant recipients, or those with weakened immune systems. It can also help diagnose or monitor CMV infection in certain conditions.

What to Expect Before the Test

No special preparation is needed. A blood sample is drawn from a vein, usually in your arm. The process takes a few minutes, and you may feel slight discomfort.

What the Results Mean

Results typically show whether you have IgG, IgM, or both antibodies. IgG antibodies suggest past exposure, while IgM antibodies indicate a recent infection. Combined results help assess your immune response to CMV.

Common Conditions Monitored

This test is often used to monitor CMV in people undergoing organ transplants, those with HIV/AIDS, or those with other immune deficiencies. It can also guide decisions during pregnancy to prevent congenital CMV infections.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: CMV Antibodies Play a Critical Role in Infection Management

Short name

CMV Antibody Panel

Frequently asked questions

How long will I need to wait for my results?
Results are usually available within 3–7 business days, depending on lab processing times. Your healthcare provider will contact you with the final report.
Can I get false-positive or false-negative results?
While rare, false results can occur due to lab errors or timing (e.g., testing too soon after exposure). Confirmatory testing may be needed if initial results are unclear.
Does this test detect active CMV disease, or just past exposure?
This test detects antibodies, which indicate past exposure or immune response, but does not directly measure active infection. Active CMV disease may require additional testing, such as viral load or PCR.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy