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Epstein-Barr Virus Nuclear Antigen Antibody, IgM (Serum)

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

This test measures the presence of IgM antibodies to Epstein-Barr virus (EBV) in your blood. IgM antibodies typically appear shortly after infection and can help identify recent EBV exposure.

Quick summary

["IgM antibodies to EBV may indicate a recent infection, often during the acute phase of illness."]

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

Key facts at a glance

LOINC
110854-7
Short code
EBV NA Ab Msmt Ser
Synonyms
EBV NA Ab Msmt Ser
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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?

This test detects IgM antibodies specific to the EBV nuclear antigen (EBNA). IgM is the first type of antibody your immune system produces in response to a new infection. If you have recent symptoms like fever, fatigue, or swollen lymph nodes, this test can help determine if EBV is the cause.

When Might You Need This Test?

Your healthcare provider may order this test if you have symptoms suggestive of EBV infection, such as sore throat, swollen glands, or rash. It’s also used in certain diagnostic workups for conditions like infectious mononucleosis or to monitor immune responses in specific clinical scenarios.

How Is the Test Performed?

A blood sample is drawn from a vein in your arm. The serum portion is then tested using an immunoassay method to detect IgM antibodies against EBV. The result is reported as either positive or negative, indicating the presence or absence of these antibodies.

What Are Possible Results?

A positive result suggests recent EBV infection, while a negative result means no detectable IgM antibodies were found in this sample. False positives or negatives can occur, so results should be interpreted by your healthcare provider in the context of your symptoms and medical history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

EBV IgM Antibody

Frequently asked questions

Why is this test important?
This test helps confirm a diagnosis of acute EBV infection, particularly in cases where symptoms like fever, fatigue, or lymphadenopathy are present. It can also guide further evaluation if EBV is suspected in conditions like mononucleosis or immune-related disorders.
Can this test be used to diagnose long-term EBV infection?
No, this test specifically measures IgM antibodies, which are short-lived. For long-term EBV status, other tests (such as EBV viral capsid antibody or DNA testing) may be used to assess past or persistent infection.
What if my test result is positive but I don’t have symptoms?
A positive result could indicate recent exposure to EBV, even if you’re asymptomatic. Some people may not develop noticeable symptoms, but it’s still important to discuss your result with your healthcare provider to understand the next steps, especially if you’re pregnant, immunocompromised, or have a history of related health conditions.
  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