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Cytomegalovirus (CMV) Antibody Profile, Serum/Plasma

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

This test measures antibodies to the cytomegalovirus (CMV), a common virus that can affect nearly everyone at some point in life. It helps determine if your immune system has recognized and fought off the virus.

Quick summary

["Assessing past or current CMV exposure to guide medical decisions."]

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

Key facts at a glance

LOINC
47430-4
Short code
CMV Ab SerPl Donr Ql
Synonyms
CMV Ab SerPl Donr Ql
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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

What Does This Test Measure?

The test detects two types of antibodies: IgG and IgM. IgG antibodies typically appear after an initial infection and can persist for years, indicating past exposure. IgM antibodies usually appear shortly after infection and may fade as the body clears the virus.

Why Might You Need This Test?

Doctors may order this test if you have symptoms of CMV infection (such as fever, fatigue, or organ damage), if you’re immunocompromised (e.g., due to HIV, chemotherapy, or organ transplant), or if you’re pregnant to check for potential risks to your baby.

How Is the Test Done?

A blood sample is taken from a vein in your arm. The serum or plasma is then tested in a lab to measure antibody levels using immunoassay methods.

What Are the Results Typically Used For?

Results help determine if you’ve had CMV before, if you’re currently infected, or if you’re at risk of spreading the virus. They also guide decisions about treatment, monitoring, or preventive measures.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: CMV Antibodies Play a Key Role in Diagnosing and Managing Infection.

Short name

CMV Antibody Test

Frequently asked questions

How long do IgM antibodies last after infection?
IgM antibodies usually decline within weeks to months after an infection, but their exact duration depends on the individual’s immune response. IgG antibodies, however, can remain for years.
Can this test be used to diagnose active CMV infection?
While this test confirms past or current exposure, it’s not a direct diagnostic for active infection. Doctors may use additional tests (like viral load or PCR) to check for active CMV in immunocompromised individuals.
Do I need to fast or avoid certain foods before this test?
No special preparations are needed. However, if you’re on blood thinners or have a history of bleeding disorders, let your doctor know before the test.
  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