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Cytomegalovirus Antibody, IgA Class (Serum/Plasma)

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

This test measures the presence of Immunoglobulin A (IgA) antibodies against cytomegalovirus (CMV), a common virus that can affect the immune system.

Quick summary

["IgA antibodies to CMV help identify past or current infection."]

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

Key facts at a glance

LOINC
67805-2
Short code
CMV Ag Islt Ql IF
Synonyms
CMV Ag Islt Ql IF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
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 This Test Measures

IgA antibodies are a type of immune protein your body produces in response to infection. This test detects whether your serum or plasma contains these antibodies specific to CMV, which can indicate exposure to the virus.

Why It Might Be Ordered

Doctors may order this test if you have symptoms of CMV infection (such as fatigue, swollen lymph nodes, or organ-related issues), if you’re immunocompromised, or if you’re being evaluated for conditions linked to viral exposure.

Who Might Need This Test

People at higher risk of CMV, such as those with weakened immune systems (e.g., after organ transplants, chemotherapy, or HIV), pregnant individuals (to assess risk to the fetus), or individuals with chronic illnesses, may need this test.

What to Expect Before the Test

No special preparation is needed. A blood sample is drawn from a vein in your arm, similar to other blood tests. If you’re pregnant or have a history of bleeding disorders, let your healthcare provider know.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

IgA Antibody to CMV

Frequently asked questions

How long does it take to get results?
Results are typically available within 1–3 business days, depending on lab processing times. Your doctor will discuss the findings with you during your follow-up visit.
Can I have false positives or negatives?
Yes, false results can occur due to recent vaccination, cross-reacting antibodies, or lab errors. Confirmatory testing may be needed if initial results are unclear.
Does this test show active infection?
No, this test only indicates past exposure or immune response. To assess active infection, additional tests (like PCR or viral load) may be required.
  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