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Hepatitis B Core Antibody, Qualitative (Serum/Plasma)

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

This test detects antibodies to the hepatitis B core antigen, which helps identify past or current hepatitis B virus (HBV) infection.

Quick summary

["Assessing HBV exposure and immunity through antibody detection."]

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

Key facts at a glance

LOINC
39005-4
Short code
HBV core Ab Fld Ql
Synonyms
HBV core Ab Fld Ql
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 This Test Measures

The test looks for specific antibodies (immunoglobulins) produced by your immune system in response to the hepatitis B core antigen. These antibodies can appear after infection or vaccination. The presence of these antibodies indicates your body’s immune response to HBV, whether from exposure, vaccination, or recovery from infection.

Why It’s Done

Doctors may order this test to evaluate exposure to hepatitis B virus, screen for past infection, or assess immunity after vaccination. It can also help monitor chronic hepatitis B status or guide decisions about vaccination.

How the Test Works

A small blood sample is taken from your arm and sent to a lab. The serum or plasma is tested using an immunoassay method to detect the presence of hepatitis B core antibodies. The result is qualitative (positive or negative) rather than a numeric value.

What the Results Mean

A positive result means your immune system has recognized and responded to the hepatitis B core antigen, suggesting past infection or vaccination. A negative result indicates no detectable antibodies, which may mean you have never been exposed or vaccinated.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

HBV Core Antibody (Qualitative)

Frequently asked questions

What does a positive result mean?
A positive result suggests you have been exposed to the hepatitis B virus at some point, either through infection or vaccination. This does not necessarily mean you are currently infected; some people develop immunity after recovery or vaccination. If you’re unsure about your vaccination status, this test can help confirm immunity.
What does a negative result mean?
A negative result means your body does not currently have detectable antibodies against the hepatitis B core antigen. This could indicate you have never been exposed to the virus or have not yet developed immunity. If you are at risk for hepatitis B (e.g., due to occupation or lifestyle), further testing or vaccination may be recommended.
How often should I get this test?
This test is typically ordered as needed, depending on your medical history, risk factors, or vaccination status. If you have chronic hepatitis B, your doctor may recommend periodic testing to monitor your condition. Always follow your healthcare provider’s guidance for test frequency.
  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