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Antibody to Epstein-Barr Virus (EBV) Nucleocapsid Protein (IgG) - Serum/Plasma

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.

Quick summary

["Helps diagnose or monitor EBV infection and related conditions like chronic fatigue syndrome or certain cancers."]

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

Key facts at a glance

LOINC
56724-8
Short code
ENA SS-A Ab Ser Ql IB
Synonyms
ENA SS-A Ab Ser Ql IB
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ib
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

The test detects IgG antibodies against EBV’s nucleocapsid protein, a marker of past or ongoing infection. IgG antibodies are typically present after an initial infection and can linger for years.

Why It’s Ordered

Your healthcare provider may order this test if you have symptoms like fatigue, swollen lymph nodes, or if you’ve been exposed to EBV. It’s also used in research or to assess long-term immune responses.

Sample Collection and Preparation

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 EBV antibodies using immunoassay methods.

What to Expect Before the Test

No special preparation is needed, but inform your provider if you’re on blood-thinning medications or have a history of bleeding disorders.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

High levels of EBV IgG antibodies suggest past infection, while persistently elevated levels may indicate chronic infection or conditions like post-transfusion cytomegalovirus (CMV) syndrome. This test is not used to diagnose acute EBV infection but supports broader immune monitoring.

Short name

EBV IgG Antibody

Frequently asked questions

How long does it take to get results?
Results are typically available within 1–3 business days, depending on your lab’s processing schedule.
What does a positive result mean?
A positive result means your body has produced antibodies to EBV, indicating exposure to the virus at some point. It does not distinguish between acute or chronic infection.
Can this test be used to diagnose mononucleosis?
No, this test alone cannot diagnose mononucleosis. It may be used alongside other tests, like EBV viral capsid antigen (VCA) IgM, to assess immune response.
  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