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Cytomegalovirus (CMV) Antibody, IgM and IgG, Serum or 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 can help guide treatment and prevent complications, especially for people with weakened immune systems."]

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

Key facts at a glance

LOINC
43705-3
Short code
CMV Mar Ql Shell Vial Cult
Synonyms
CMV Mar Ql Shell Vial Cult
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
shell-vial-culture
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 measures two types of antibodies—IgM and IgG—in your blood. IgM antibodies typically appear early in an infection and can indicate a recent exposure. IgG antibodies usually develop later and can persist for years, showing past exposure or immunity.

Why Might You Need This Test?

You may need this test if you have symptoms like fever, fatigue, or swollen lymph nodes, especially if you suspect CMV infection. It’s also used in organ transplant recipients, pregnant individuals, or those with weakened immune systems to monitor CMV risk.

How Is the Test Performed?

A blood sample is taken from a vein in your arm. The sample is sent to a lab for analysis using immunoassay methods to detect CMV-specific antibodies.

What Are the Possible Results?

Results may show positive or negative for IgM and IgG antibodies. A positive IgM result suggests recent infection, while a positive IgG result indicates past exposure. Combined results help doctors assess infection status or immunity.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CMV Antibody Panel

Frequently asked questions

What does a positive IgM result mean?
A positive IgM result suggests you may have an active CMV infection and may need further testing or medical evaluation to manage symptoms or treatment.
How long do IgG antibodies last?
IgG antibodies can remain in your system for years after infection, indicating past exposure. However, their presence alone doesn’t confirm current infection without IgM testing.
Can CMV antibodies be affected by medications?
Yes, certain medications (like antiretrovirals or immunosuppressants) may influence antibody levels or infection risk. Always discuss your medications with your healthcare provider.
  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