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

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

This test checks for antibodies against cytomegalovirus (CMV), a common virus that can affect the immune system. It helps determine if your body has ever been exposed to CMV or if you currently have an active infection.

Quick summary

["CMV antibodies help identify past or present infection, guiding treatment and monitoring."]

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

Key facts at a glance

LOINC
109556-1
Short code
CMV DNA Msmt Amn
Synonyms
CMV DNA Msmt Amn
Category
chemistry
Sample
fluid
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
2-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
Hemolysis max
300
TAT
4–24 hours
Order
routine

What Does This Test Measure?

The test measures two types of antibodies—IgM and IgG—against CMV. IgM antibodies appear early in an infection and typically decline over time. IgG antibodies develop later and remain longer if the body has been exposed to CMV.

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 assess potential risks to your baby.

Who Should Consider This Test?

People at higher risk of CMV complications, such as transplant recipients, those with weakened immune systems, or pregnant individuals, may need this test. It’s also used in screening for congenital CMV in newborns.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from your arm. If you’re pregnant, inform your healthcare provider before the test.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CMV Antibody Panel

Frequently asked questions

Positive IgM antibodies suggest an active CMV infection, while IgG antibodies indicate past exposure. Together, they help diagnose infection, monitor treatment, or assess risk in high-risk patients.
This test is not a direct measure of viral load but helps determine immune response to CMV.
IgG antibodies alone don’t confirm an active infection; they only show prior exposure.
Results may take 1–2 weeks to return, depending on lab processing.
Can I get CMV from this test? No, the test uses sterile blood collection methods to prevent contamination.
If my results show IgM antibodies, will I need treatment? Treatment depends on your symptoms, immune status, and healthcare provider’s recommendation.
  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