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Cytomegalovirus (CMV) IgG Antibody, Qualitative Probe (Serum/Plasma)

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

This test checks for the presence of antibodies against the cytomegalovirus (CMV) in your blood. Antibodies are your body’s immune response to a virus it has encountered before.

Quick summary

["Knowing your CMV antibody status helps determine if you’ve been exposed to CMV and may influence vaccination or infection risk decisions."]

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

Key facts at a glance

LOINC
88545-9
Short code
CMV DNA # DBS NAA+probe
Synonyms
CMV DNA # DBS NAA+probe
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
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 CMV-specific IgG antibodies, which develop after your immune system has fought off the virus. These antibodies remain in your blood long after the infection has cleared, serving as a marker of past exposure.

Why Might You Need This Test?

Doctors may order this test if you’re at higher risk for complications from CMV, such as during pregnancy (to check for transmission risks to your baby), in immunocompromised individuals, or before organ transplants.

What Does a Positive Result Mean?

A positive result means your body has produced antibodies against CMV, indicating past infection. This does not mean you currently have an active infection but confirms you’ve been exposed.

What Does a Negative Result Mean?

A negative result suggests you either have never been exposed to CMV or your immune system hasn’t yet produced detectable antibodies. This may require further testing if clinical suspicion remains high.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

CMV IgG antibodies are important for guiding preventive measures. For example, pregnant individuals with a negative result may need additional screening or monitoring. For transplant patients, knowing your status helps tailor immune-suppressive therapy to reduce infection risks without over-suppressing your immune system.

Short name

CMV IgG Antibody (Qualitative)

Frequently asked questions

How is this test different from a CMV IgM test?
CMV IgG tests for past exposure, while CMV IgM tests for recent infection. IgG antibodies typically persist longer than IgM, so IgG is used to confirm past encounters with the virus.
What does it mean if my test is positive but I don’t have symptoms?
A positive IgG result alone doesn’t indicate active illness. Many people with past CMV exposure are asymptomatic. Symptoms would only appear if you were infected recently or have an immune system that’s weakened.
Can I get this test at home?
No, this test requires a blood sample collected by a healthcare provider in a clinical setting. Home tests for antibodies are not typically available for this specific purpose.
  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