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Cytomegalovirus (CMV) Antibody, IgG

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

This test checks for the presence of Immunoglobulin G (IgG) antibodies against Cytomegalovirus (CMV), a common virus that can affect people of all ages.

Quick summary

["IgG antibodies indicate past infection or immunity to CMV."]

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

Key facts at a glance

LOINC
88566-5
Short code
CMV Ag Mar Ql IF
Synonyms
CMV Ag Mar Ql IF
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

What Does This Test Measure?

The test detects IgG antibodies specific to CMV in your blood. These antibodies develop after your body has been exposed to the virus, either through infection or vaccination (if applicable). IgG antibodies remain in your system for a longer period compared to other types of antibodies.

Why Might You Need This Test?

Your healthcare provider may order this test if you have symptoms of CMV infection, such as fever, fatigue, or organ damage, or if you are at higher risk for complications, such as during pregnancy, organ transplantation, or if you have a weakened immune system.

When Might You Get Results Back?

Results are typically available within a few days to a week after your blood sample is drawn. Your doctor will discuss the results with you and explain what they mean in the context of your health.

What Are Possible Results?

A positive result means you have detectable IgG antibodies to CMV, suggesting past infection. A negative result means no detectable IgG antibodies were found, which could mean you have never been exposed to CMV or the test was taken too early after exposure.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CMV IgG Antibody

Frequently asked questions

How Often Do I Need This Test?
This test is generally not routinely recommended for healthy individuals without symptoms or risk factors. It may be used periodically for people in high-risk groups, such as pregnant women, transplant recipients, or those with HIV/AIDS, to monitor immunity or infection status.
What Does a Positive Result Mean for My Health?
A positive result indicates you have been exposed to CMV at some point. This does not necessarily mean you are currently infected, but it does mean your body has developed immunity. If you are pregnant, this result can help guide care to prevent potential harm to your baby.
Can I Get CMV If I Have a Positive IgG Test?
Yes, it is possible to get infected with CMV again even if you have a positive IgG test. CMV can reactivate in people with weakened immune systems, leading to new infections.
  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