What does a hepatitis B core antibody result mean?

The core antibody is one part of a hepatitis B blood-test panel. A positive result can fit with a current infection, a past infection, or a less clear pattern that needs repeat or additional testing. Vaccination alone does not usually create core antibody. A negative result may mean no previous exposure, although timing and the wider test pattern matter.

Ask the clinician to interpret the core antibody alongside surface antigen, surface antibody, symptoms, and your exposure history. They may arrange repeat testing, viral testing, or a [Liver Function Test](/treatments/diagnostics-and-screening/liver-function-test/). Do not assume that one result confirms or excludes all forms of hepatitis B. Discuss [Hepatitis B Vaccination](/treatments/preventive-care-and-vaccination/hepatitis-b-vaccination/) if you are not protected.

Arrange timely medical review for a positive result, a recent exposure, pregnancy, or symptoms such as marked tiredness, [Dark Urine](/symptoms/dark-urine/), yellow eyes, or repeated vomiting. Seek urgent help for confusion, severe abdominal pain, or rapidly worsening illness. More background is available under [Hepatitis B](/conditions/hepatitis-b/).

Ask what the complete panel shows, whether the pattern suggests current or past infection, whether your liver needs monitoring, and whether household or sexual contacts need testing.