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Epstein-Barr Virus (EBV) Antibody Profile: IgG and IgA Antibodies to VCA (Viral Capsid Antigen) and EA (Early Antigen) by Immunoassay

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

This test measures your immune system’s response to Epstein-Barr virus (EBV), a common virus that can cause infections like mononucleosis. It helps determine if you’ve been exposed to EBV and whether your body has produced antibodies against it.

Quick summary

["This test helps diagnose or monitor EBV infection and assess immune response over time."]

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

Key facts at a glance

LOINC
93712-8
Short code
EBV NA Ab Ser Donr Ql IA
Synonyms
EBV NA Ab Ser Donr 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 two types of antibodies (IgG and IgA) against specific proteins of the Epstein-Barr virus: viral capsid antigen (VCA) and early antigen (EA). IgG antibodies typically develop after initial infection and persist long-term, while IgA antibodies may appear earlier or in certain immune conditions.

Why Might You Need This Test?

Your healthcare provider may order this test if you have symptoms of EBV infection (e.g., fever, fatigue, swollen lymph nodes), if you’re being evaluated for a chronic illness linked to EBV, or if you’re immunocompromised and need monitoring for viral activity.

How Is the Sample Collected?

A blood sample is drawn from a vein in your arm. The blood is processed to separate serum or plasma, which is then tested for specific antibodies using an immunoassay method.

What Are the Results Typically Used For?

Results help confirm a diagnosis of EBV infection, distinguish between acute and chronic infection, or assess immune response in patients with conditions like lymphoma or autoimmune diseases.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: This test is critical for diagnosing EBV-related illnesses, guiding treatment decisions, and monitoring patients with persistent symptoms or underlying health conditions linked to the virus.

Short name

EBV Antibody Screening/Confirmatory Panel

Frequently asked questions

What does a positive result mean?
A positive result indicates that your immune system has detected EBV antibodies, suggesting past or current infection. However, a single positive test does not confirm active disease without clinical correlation.
Can this test detect acute EBV infection?
Yes, IgA antibodies to VCA or EA may appear earlier than IgG antibodies, helping identify acute infection. However, results alone cannot determine the severity or timing of infection without clinical context.
How long do EBV antibodies last?
IgG antibodies often remain detectable for years after infection, while IgA antibodies may decline over time. Results should be interpreted alongside symptoms and clinical findings, not as standalone indicators of long-term immunity.
  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