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Antibody to Epstein-Barr Virus Nuclear Antigen (EBNA) - Immunoassay

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

This blood test measures antibodies against Epstein-Barr virus (EBV) nuclear antigen (EBNA), helping assess your immune response to EBV infection.

Quick summary

["Helps diagnose or monitor EBV infection and immune response over time."]

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

Key facts at a glance

LOINC
29954-5
Short code
ENA Ab Ser IA-aCnc
Synonyms
ENA Ab Ser IA-aCnc
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 Is This Test Measuring?

EBV is a common virus that can cause infections like mononucleosis. After infection, your body produces antibodies, including those against EBNA, as part of its immune response. This test detects these antibodies to track your body’s reaction to past or current EBV exposure.

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’re being evaluated for conditions linked to EBV, such as certain cancers or autoimmune diseases.

How Is the Test Performed?

A blood sample is drawn from a vein in your arm. The sample is then tested using an immunoassay method to identify EBNA antibodies in your serum.

What Are Possible Results?

Results are qualitative (positive or negative) and indicate whether EBNA antibodies are present. A positive result suggests past or current EBV infection, while a negative result may mean no detectable antibodies or an early infection.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

EBNA Antibody Test

Frequently asked questions

What does a positive result mean?
A positive result means your body has produced EBNA antibodies, indicating past or ongoing EBV infection. This doesn’t always mean you’re currently sick, but it confirms your immune system has encountered EBV.
Could this test be used to diagnose active EBV infection?
No, this test alone cannot diagnose active EBV infection. It’s typically used alongside other tests (like viral load or antibody to viral capsid antigen) for a full assessment.
Is this test sensitive to recent infections?
This test may not detect recent infections immediately. Antibodies take time to develop, so results may reflect past exposure rather than acute infection.
  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