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

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

This test checks for antibodies to the cytomegalovirus (CMV), a common virus that can affect many organs, including the eyes, lungs, and liver. It helps determine if your immune system has ever been exposed to CMV.

Quick summary

["This test helps assess past infection with CMV and supports diagnosis or monitoring of certain conditions."]

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

Key facts at a glance

LOINC
10524-7
Short code
Cyto Cvx
Synonyms
Cyto Cvx
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
cyto-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

Why This Test Might Be Ordered

Your healthcare provider may order this test if you have symptoms of CMV infection, such as fever, fatigue, or organ-related issues, or if you’re at higher risk due to conditions like HIV/AIDS, organ transplants, or certain immune disorders. It may also be used to monitor people who have been exposed to CMV or those receiving treatments that weaken the immune system.

What to Expect Before the Test

No special preparation is needed. A blood sample is typically drawn from a vein in your arm. You may feel slight discomfort, but it usually lasts only a few minutes.

What the Test Results Mean

Positive results indicate the presence of CMV antibodies, suggesting past infection. Negative results mean no detectable antibodies, indicating either no prior exposure or recent infection that hasn’t yet developed antibodies. Consult your provider for interpretation based on your medical history and symptoms.

Common Uses and Considerations

This test is often used in conjunction with other tests to diagnose CMV infection, especially in people with weakened immune systems. It can also help guide treatment decisions or monitor disease progression.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CMV IgG Antibody

Frequently asked questions

How long will it take to get my results?
Results are usually available within 1 to 3 business days, depending on your lab. Follow-up with your healthcare provider to discuss the meaning of your results in the context of your health.
Can I have my blood drawn if I’m on blood thinners?
If you’re on blood thinners, inform your healthcare provider before the test. They may adjust your medication or take extra precautions to ensure safe blood drawing.
What if my results are positive but I don’t have symptoms?
A positive result means you’ve likely had CMV at some point, but it doesn’t always cause symptoms. If you’re at high risk (e.g., transplant recipient, HIV-positive), your provider may monitor you closely for complications or further testing.
  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