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Epstein-Barr Virus (EBV) Antibody Profile: IgG to Nucleocapsid Antigen (VCA-N)

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

This test measures your body’s immune response to the Epstein-Barr virus (EBV), a common virus that can cause infections like mononucleosis. It helps doctors assess past or current EBV exposure.

Quick summary

["This test helps track your immune reaction to EBV, which can indicate past infection or ongoing immunity."]

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

Key facts at a glance

LOINC
109470-5
Short code
EBV DNA Msmt CSF
Synonyms
EBV DNA Msmt CSF
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

Why This Test Matters

EBV is often harmless but can cause illness in some people. This test helps determine if you’ve been exposed to EBV, which can influence whether you’re at risk for certain conditions or need further monitoring.

What the Test Measures

The test detects IgG antibodies specific to the EBV nucleocapsid antigen (VCA-N). These antibodies develop after your body has encountered the virus, signaling a past infection or sustained immunity.

How the Test Works

Blood is drawn and tested using an immunoassay method to identify the presence of IgG antibodies against EBV. This helps differentiate between recent and long-term exposure.

What It Could Mean

Positive results suggest past EBV infection, while persistently high levels may indicate chronic infection or ongoing immune activity. This can guide decisions about further testing or treatment.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is often used to diagnose or monitor EBV-related conditions, such as infectious mononucleosis, or to assess immune status in individuals with weakened immunity. It may also help evaluate risks for EBV-associated cancers or autoimmune reactions in certain populations.

Short name

EBV IgG VCA-N Antibody

Frequently asked questions

What does a positive result mean?
A positive result means your body has produced antibodies against EBV, indicating past exposure. This does not necessarily mean you’re currently infected, but it confirms your immune system has encountered the virus.
Could this test be used to diagnose active EBV infection?
This test alone is not typically used to diagnose active EBV infection. Doctors may order additional tests, such as those for viral load or other EBV-specific antibodies, to assess current infection status.
Why would my doctor request this test?
Your doctor may request this test if you have symptoms of EBV infection (e.g., fatigue, swollen lymph nodes), if you’re at higher risk (e.g., immunocompromised), or if monitoring EBV exposure is needed for medical reasons.
  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