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Hepatitis B serology summary

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

Tests

Results

Interpretation

HBsAg

Anti-HBc

Anti-HBs

Negative

Negative

Negative

Naïve, susceptible

HBsAg

Anti-HBc

Anti-HBs

Negative

Positive

Positive

Immune due to natural infection

HBsAg

Anti-HBc

Anti-HBs

Negative

Negative

Positive

Immune due to Hepatitis B vaccination

HBsAg

Anti-HBc

IgM Anti-HBc

Anti-HBs

Positive

Positive

Positive

Negative

Acutely infected

HBsAg

Anti-HBc

IgM Anti-HBc

Anti-HBs

Positive

Positive

Positive or Negative

Negative

Chronically infected

HBsAg

Anti-HBc

Anti-HBs

Negative

Positive

Negative

 

  • isolated HBcAb, 4 possible causes:
    • 1) It may be the only serum marker of acute hepatitis B infection during the so-called "window phase" between disappearance of HBsAg and appearance of HBsAb
    • 2) It may represent a remote resolved infection with the decline of HBsAb to undetectable levels
    • 3) It could indicate ongoing chronic infection with HBsAg that is escaping detection because of low levels of HBsAg
    • 4) It may represent a false-positive test (rare)

Source: Dr John Wong, Consultant Gastroenterologist, University Hospitals Coventry and Warwickshire (May 2008).

Phases of Hepatitis B infection - relates HbeAg and HBV DNA levels

  • immune-tolerance phase
    • the immune-tolerance phase is seen in HBeAg-positive disease and is characterised by high levels of HBV replication with normal ALT levels and limited liver necroinflammation
    • because there is minimal immune response to the virus it is unusual for spontaneous HBeAg loss to occur
    • this phase is commonly seen in children

  • immune-clearance phase
    • followed by an immune-clearance or immune-reactive phase in which the immune system recognises and starts to clear the virus
      • ALT levels are typically elevated or fluctuating, and there is a higher risk of liver fibrosis
      • tends to be the initial phase in people infected with HBV as adults
        • lasts from weeks to years and ends with HBeAg seroconversion

  • immune-control phase
    • with the loss of HBeAg the person may enter an immune-control phase with very low or undetectable HBV DNA levels, normal ALT and minimal fibrosis progression
    • anti-HBe positive

  • immune-escape phase
    • however, some people may experience rising HBV DNA levels despite HBeAg negativity. This is caused by virions that do not express HBeAg because of genetic mutations
      • this immune-escape phase can lead to active necroinflammation and progression of fibrosis
      • anti-HBe positive

 

Notes:

  • HBeAg seroconversion
    • HBeAg seroconversion occurs when people infected with the HBeAg-positive form of the virus develop antibodies against the 'e' antigen.
      • the seroconverted disease state is referred to as the 'inactive HBV carrier state' when HBeAg has been cleared, anti-HBe is present and HBV DNA is undetectable or less than 2000 IU/ml. Once seroconversion has taken place, most people remain in the inactive HBV carrier state (the immune-control phase)
        • however, increasing HBV DNA and recurrent hepatitis after seroconversion indicate the emergence of the HBeAgnegative strain of the virus (the immune-escape phase). people may experience rising HBV DNA levels despite HBeAg negativity. This is caused by virions that do not express HBeAg because of genetic mutations. This immune-escape phase can lead to active necroinflammation and progression of fibrosis
  • a form of the virus that does not cause infected cells to secrete HBeAg has been discovered (sometimes called the 'precore mutant' strain)
    • people can be infected with the so-called HBeAg-negative form of the virus from the beginning, or the viral mutation can emerge later in the course of infection in people initially infected with the HBeAg-positive form of the virus
    • prevalence of HBeAg-negative hepatitis varies geographically; it is more common in Asia and the Mediterranean region than in Northern Europe

Reference:


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