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Cytomegalovirus (CMV) Antibody, IgG, Serum/Plasma

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

This test measures the presence of Immunoglobulin G (IgG) antibodies to the cytomegalovirus (CMV), a common virus that can affect people of all ages.

Quick summary

["IgG antibodies indicate past or current infection by CMV, helping doctors assess immunity or exposure risk."]

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

Key facts at a glance

LOINC
10660-9
Short code
CMV Ag Tiss Ql ImStn
Synonyms
CMV Ag Tiss Ql ImStn
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
immune-stain
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?

IgG antibodies are a type of protein your immune system produces in response to CMV infection. If you have these antibodies, it suggests your body has either already fought off the virus or is still responding to it. This test doesn’t detect active infection directly but helps determine if you’ve been exposed before.

Why Might You Need This Test?

Doctors may order this test if you have symptoms of CMV infection (like fatigue, fever, or organ issues), 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.

Who Typically Needs This Test?

People with weakened immune systems, pregnant women, transplant recipients, or those with chronic illnesses (like HIV or lupus) are often tested for CMV antibodies to monitor exposure or prevent complications.

What Does a Positive Result Mean?

A positive result means you likely have IgG antibodies to CMV, indicating past exposure. This doesn’t mean you’re currently sick, but it confirms your body has developed immunity. If you’re immunocompromised, this can help guide treatment decisions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Why This Test Matters

Short name

CMV IgG Antibody

Frequently asked questions

How Long Does It Take to Get Results?
Results are typically available within 1 to 3 business days, depending on your lab. Follow-up with your healthcare provider to discuss the meaning of your results.
What If My Results Are Negative?
A negative result means you likely haven’t been exposed to CMV through IgG antibodies. If you’re at risk (e.g., immunocompromised or pregnant), your doctor may recommend additional testing or preventive measures.
Can I Get CMV Without Having Antibodies?
Yes. Some people may not develop detectable IgG antibodies, especially if they’ve had a mild or asymptomatic infection. Your doctor may still recommend monitoring or other tests if you’re at higher risk.
  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