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Difficulty: MediumGastroenterology and Hepatology

Match each of the following Hepatitis B serologic profiles with the most accurate clinical interpretation. Assume all patients have normal liver enzymes and no clinical signs of acute liver failure.

  • HBsAg(+), Anti-HBc IgM(+), Anti-HBs(-), HBeAg(+)Acute Hepatitis B infection
  • HBsAg(-), Anti-HBc IgG(+), Anti-HBs(+), HBeAg(-)Immunity secondary to natural infection
  • HBsAg(-), Anti-HBc(-), Anti-HBs(+), HBeAg(-)Immunity secondary to vaccination
  • HBsAg(+), Anti-HBc IgG(+), Anti-HBs(-), HBeAg(-), Anti-HBe(+)Chronic Hepatitis B infection with low viral replication

Answer

Serology 1 matches Acute Hepatitis B; Serology 2 matches Immunity from natural infection; Serology 3 matches Immunity from vaccination; Serology 4 matches Chronic Hepatitis B (low replication).
Each serologic panel corresponds precisely to a specific pathophysiologic stage of Hepatitis B exposure. HBsAg defines active virus. Anti-HBc defines natural exposure, differentiating acute (IgM) from chronic/resolved (IgG). Anti-HBs defines immunity.

Step-by-Step Solution

1
Evaluate the Hepatitis B surface antigen (HBsAg) status.
Positive HBsAg indicates active infection (acute or chronic); negative HBsAg indicates no current active infection.
HBsAg is the hallmark of active viral presence in the host.
2
Examine the Hepatitis B core antibody (Anti-HBc) profile.
IgM implies an early, acute phase. IgG implies a prolonged exposure (chronic) or a fully resolved past infection.
Core antibodies develop against the viral nucleocapsid only during natural infection, never from vaccination.
3
Determine the Hepatitis B surface antibody (Anti-HBs) status.
A positive Anti-HBs provides neutralizing immunity. If alone, it is from a vaccine. If paired with Anti-HBc IgG, it is from a cleared natural infection.
Vaccines only contain the surface antigen, whereas natural infections expose the host to the entire virus.
4
Assess the HBeAg and Anti-HBe status in HBsAg-positive profiles.
HBeAg marks high viral replication, whereas Anti-HBe marks low replication and an inactive carrier state.
HBeAg is a surrogate marker for viral load and infectivity.

Key Concept

Interpretation of Hepatitis B viral serology to determine acute infection, chronic infection, resolution, and vaccination status.
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Topics

Gastroenterology and Hepatology

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