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Cytomegalovirus Antibody, Total (IgG and IgM) in Serum/Plasma

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

This test measures the total antibodies (IgG and IgM) against cytomegalovirus (CMV), a common virus that can affect the immune system. It helps determine if you’ve been exposed to CMV or if your body is actively fighting the infection.

Quick summary

["CMV antibodies help track past or current infection, guiding treatment decisions."]

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

Key facts at a glance

LOINC
9514-1
Short code
CMV Ab Titr CSF CF
Synonyms
CMV Ab Titr CSF CF
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
comp-fix
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

Why This Test Matters

CMV is a virus that can cause serious health issues, especially in people with weakened immune systems, pregnant individuals, or those undergoing organ transplants. Detecting CMV antibodies helps doctors assess exposure risk and monitor infection progression.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample (serum or plasma) via a simple venipuncture. The test is typically done in a lab setting and results are ready within a few days.

How the Test Works

The test uses an immunoassay method to detect both IgG and IgM antibodies against CMV. IgG antibodies indicate past infection or long-term immunity, while IgM antibodies suggest recent infection.

Possible Results and Their Meanings

A positive result for CMV antibodies means you’ve likely been exposed to the virus. IgG alone suggests immunity or past infection, while IgM alone may indicate an active infection. Negative results mean no detectable antibodies, which could mean you’ve never been exposed or the test was taken too early.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CMV Antibody Total

Frequently asked questions

What does a positive CMV antibody test mean for me?
A positive test means you’ve been exposed to CMV at some point. IgG antibodies indicate immunity or past infection, while IgM antibodies suggest recent infection. Your doctor will discuss next steps based on your health status and symptoms.
Can I get CMV from my partner or family?
Yes, CMV can spread through close contact, such as saliva, tears, or bodily fluids. Pregnant individuals should avoid close contact with infected individuals to reduce risk to the baby.
How long do CMV antibodies stay in my system?
IgG antibodies typically remain in your system for life after infection, providing long-term immunity. IgM antibodies may decrease over time but can persist for months or years, depending on the individual’s immune response.
  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