Understanding a hepatitis B surface antibody result

The surface antibody, often written anti-HBs, may be reported as reactive, positive, non-reactive, or negative according to the laboratory's system. A detected antibody can be consistent with vaccination or recovery from infection. An undetected antibody can mean no measurable response, an incomplete history, or another situation that needs the companion results. The result alone cannot confirm active infection or explain symptoms. For background, see [Hepatitis B](/conditions/hepatitis-b/).

Bring the report, vaccination record, and dates of any possible exposure to your appointment. Ask the clinician to interpret the surface antibody alongside the other hepatitis B markers. Depending on that review, you may be offered vaccination, repeat testing, or monitoring. If symptoms suggest liver irritation, a [Liver Function Test](/treatments/diagnostics-and-screening/liver-function-test/) may be included, but it answers a different question. Read about [Hepatitis B Vaccination](/treatments/preventive-care-and-vaccination/hepatitis-b-vaccination/) before making assumptions about protection.

Arrange prompt care for yellowing of the eyes or skin, dark urine, severe abdominal discomfort, ongoing vomiting, or marked drowsiness. If there has been a recent exposure, seek advice promptly even without symptoms. Fatigue is nonspecific, but persistent fatigue combined with appetite change, nausea, or jaundice should be assessed; related information is available for [Dark Urine](/symptoms/dark-urine/) and [Fatigue](/symptoms/fatigue/).

Ask what your exact reported value or wording means, which other hepatitis B markers were tested, whether vaccination explains the pattern, and whether you need another sample. Ask about precautions for sexual and household contacts while the result is being clarified.