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Cytomegalovirus Antibody, IgA (Serum) – Confirmatory

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

This test checks for the presence of Immunoglobulin A (IgA) antibodies against cytomegalovirus (CMV), a common virus that can affect the immune system. IgA antibodies are part of your body’s immune response and may indicate past or ongoing infection.

Quick summary

["IgA antibodies to CMV can help diagnose or monitor infection, especially in certain groups like transplant recipients or those with weakened immune systems."]

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

Key facts at a glance

LOINC
16712-2
Short code
CMV Ab Fld-aCnc
Synonyms
CMV Ab Fld-aCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 Might This Test Be Ordered?

Your healthcare provider may recommend this test if you have symptoms like fatigue, fever, or organ involvement (e.g., liver, lungs) that could suggest CMV infection. It may also be used to confirm a diagnosis in people with known risk factors, such as after organ transplantation or in immunocompromised patients.

What Does a Positive Result Mean?

A positive result suggests your body has produced IgA antibodies against CMV, meaning you likely had exposure to the virus at some point. This does not always mean you’re currently infected but could indicate past infection or chronic infection in certain cases.

What Does a Negative Result Mean?

A negative result means your blood sample did not detect IgA antibodies against CMV at the time of testing. This could mean you have never been exposed or that your immune system is not currently responding to the virus.

How Is This Test Performed?

A blood sample is drawn from a vein in your arm. The sample is then sent to a lab for testing using an immunoassay method to detect IgA antibodies specific to CMV.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CMV IgA Antibody (Confirm)

Frequently asked questions

What Does It Mean If I Have a High or Low IgA Antibody Level?
A high IgA level suggests a past or ongoing immune response to CMV, but it does not directly indicate active infection. Your healthcare provider will consider clinical symptoms, other test results, and your medical history to interpret results.
Can IgA Antibodies Change Over Time?
Yes, IgA antibody levels can fluctuate. After an initial infection, IgA levels may decline as your immune system shifts to producing other types of antibodies (like IgG). Retesting may be needed if symptoms persist or if monitoring for chronic infection is required.
Is This Test Different from CMV IgG Testing?
Yes. IgG antibodies are typically more commonly tested for CMV because they provide a broader picture of past infection and immunity. IgA testing is often used in specific contexts, such as confirming infection in certain patient groups or assessing immune response in chronic cases.
  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