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Antibody to Epstein-Barr Virus (IgA) in Serum/Plasma

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

This test measures the presence of Immunoglobulin A (IgA) antibodies against Epstein-Barr Virus (EBV) in your blood. These antibodies help your immune system recognize and fight infections caused by EBV.

Quick summary

["IgA antibodies to EBV can indicate past or current EBV infection."]

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

Key facts at a glance

LOINC
63391-7
Short code
ENA Ab Ser Ql IA
Synonyms
ENA Ab Ser Ql IA
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
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 detects specific antibodies (IgA) your immune system produces in response to Epstein-Barr Virus (EBV). EBV is a common virus that can cause infections like mononucleosis and is linked to certain cancers. IgA antibodies are part of your body’s immune defense and can appear after exposure to the virus.

Why Might You Need This Test?

Doctors may order this test if you have symptoms of EBV infection (e.g., fatigue, swollen lymph nodes) or if you have been exposed to someone with EBV. It can also help diagnose conditions like chronic fatigue syndrome or certain autoimmune diseases linked to EBV.

How Is the Test Performed?

A small blood sample is taken from a vein in your arm. The sample is sent to a lab where it is analyzed to detect IgA antibodies against EBV using immunoassay methods.

What Are Possible Results?

A positive result means your body has produced IgA antibodies to EBV, suggesting past or current infection. A negative result means no detectable IgA antibodies were found, but this does not always rule out EBV exposure.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

IgA Anti-EBV Antibody

Frequently asked questions

Why is this test important?
This test helps confirm if you have had an EBV infection, which can affect your immune system and may be linked to long-term health concerns. It can also guide treatment decisions for related conditions.
What does a high or low result mean?
A high IgA antibody level suggests past or active EBV infection. However, levels alone do not always indicate severity or whether the infection is resolving. Additional tests or clinical evaluation may be needed.
Can this test be used to diagnose EBV directly?
No, this test only measures antibodies—it does not directly detect the virus itself. For active EBV infection, other tests (like viral load or viral DNA testing) may be needed.
  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