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Educational draft · awaiting clinical reviewUse Rapid for revision, not patient-care decisions. Check current national and local guidance and the BNF or BNFC before acting.

Hepatitis B serology and natural history

Gastroenterology and hepatology · UK scope · Sources checked 27 Aug 2026 · Clinical review pending

RapidFull
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Escalate

Acute jaundice with encephalopathy, hypoglycaemia or increasing INR needs urgent liver-centre discussion regardless of whether HBV serology is complete. Severe hepatitis during pregnancy, immunosuppressive therapy or after withdrawal of HBV-active antiviral treatment also needs same-day specialist review. Draw virological samples promptly, but do not delay stabilisation, acute liver failure care or management of sepsis and bleeding while waiting for HBsAg, anti-HBc IgM or HBV DNA.

Synopsis

Interpret hepatitis B markers as a coherent pattern, distinguish current, resolved and vaccine-derived states, and anticipate chronic disease, reactivation and transmission risk.

  • HBsAg indicates current HBV infection; persistence for at least six months supports chronic infection rather than a single acute snapshot.
  • Total anti-HBc marks natural exposure and is not produced by vaccination, while anti-HBs indicates immunity from recovery or successful vaccination.
  • HBsAg-negative, anti-HBc-negative, anti-HBs-positive is the typical vaccine-derived pattern when the history fits.
  • HBsAg-negative, anti-HBc-positive, anti-HBs-positive usually represents resolved natural infection but still carries reactivation potential during immunosuppression.
  • Anti-HBc IgM supports recent acute infection, yet it can also appear during a severe flare of chronic HBV and must be interpreted contextually.
  • HBeAg often indicates higher replication, but HBeAg-negative variants can have active hepatitis and high HBV DNA; measure DNA directly.
  • The isolated anti-HBc pattern can reflect remote infection, a window phase, false reactivity or occult infection and deserves risk-based clarification.
  • Chronic HBV is dynamic: ALT, HBV DNA, fibrosis, HBeAg status and age or comorbidity together determine phase, prognosis and monitoring.

    • Key red flags

    Acute liver failure

    Confusion, hypoglycaemia and increasing INR during acute HBV indicate failing hepatic function and require immediate regional transplant-centre involvement.

    Investigation priorities

    01
    HBsAg with confirmatory testingFirst step

    Establish current surface-antigen positivity and avoid acting on analytical false reactivity.

    Management branches

    DecodeRead the marker pattern

    HBV screening returns one or more reactive antigen or antibody results.

    1. Confirm HBsAg reactivity through the laboratory algorithm, assemble HBsAg, total anti-HBc and anti-HBs together, and retrieve vaccination and previous testing history.
    2. Use IgM anti-HBc, HBeAg, anti-HBe and HBV DNA to answer specific timing and replication questions rather than attaching a phase from a single marker.
    3. If the combination is discordant or isolated anti-HBc is present, repeat or confirm tests and seek virology input, especially before immunosuppression, blood donation or pregnancy decisions.
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    Sources and review status4 sources · checked 27 Aug 2026 · clinical review pending+
    Sources

    Sources and review status

    National guidance is shown before implementation-dependent detail. Apply principles in context and verify current guidance when a decision affects care. Source check completed 27 Aug 2026; clinical approval remains outstanding.

    • UKHSA hepatitis B clinical and public-health managementOfficial UK description of HBV antigens, antibodies, diagnosis, transmission and public-health management.
    • NICE CG165 chronic hepatitis B recommendationsNational assessment, referral, treatment, monitoring, pregnancy and HCC-surveillance recommendations.
    • UKHSA hepatitis B Green Book chapterCurrent vaccination, post-exposure and at-risk contact guidance.
    • UKHSA HBV screening confirmation flowchartCurrent confirmatory HBsAg and additional-marker laboratory sequence used in antenatal screening.

    Editorial contact: Doctor’s Passport editorial team. Source-check date is separate from clinical approval. Report a content problem · Content changes

    Authoring stateRapid draftClinical stateAwaiting reviewJurisdictionUnited Kingdom