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Difficulty: HardGastroenterology and Hepatology

Hepatitis B virus (HBV) infection can present in various clinical phases, each characterized by a distinct serologic profile. Match each clinical status with its most representative hepatitis B serologic panel.

  • Acute hepatitis B infection (window period)HBsAg: Negative | Anti-HBs: Negative | Anti-HBc: IgM Positive | HBeAg: Negative
  • Chronic inactive hepatitis B carrierHBsAg: Positive | Anti-HBs: Negative | Anti-HBc: IgG Positive | HBeAg: Negative | ALT: Normal
  • Resolved natural hepatitis B infectionHBsAg: Negative | Anti-HBs: Positive | Anti-HBc: IgG Positive | HBeAg: Negative
  • Immunity due to hepatitis B vaccinationHBsAg: Negative | Anti-HBs: Positive | Anti-HBc: Negative | HBeAg: Negative
  • Chronic hepatitis B infection (high infectivity)HBsAg: Positive | Anti-HBs: Negative | Anti-HBc: IgG Positive | HBeAg: Positive | ALT: Elevated

Answer

The correct matches map the window period to isolated Anti-HBc IgM, the inactive carrier to HBsAg (+)/normal ALT, resolved infection to Anti-HBs/Anti-HBc IgG, vaccination to isolated Anti-HBs, and high infectivity chronic infection to HBsAg (+)/HBeAg (+).
Each specific clinical phase of Hepatitis B corresponds directly to its unique pattern of surface, core, and envelope antigens and their respective antibodies, as well as the presence of active liver inflammation.

Step-by-Step Solution

1
Analyze the HBsAg status for each clinical scenario.
Active/chronic infections have HBsAg (+). Resolved infections, vaccinated patients, and window period patients have HBsAg (-).
HBsAg is the hallmark of active viral presence.
2
Differentiate the HBsAg (-) states.
Vaccination has isolated Anti-HBs (+). Resolved natural infection has Anti-HBs (+) AND Anti-HBc IgG (+). The window period has isolated Anti-HBc IgM (+).
Vaccines only contain surface antigen. Natural infection exposes the patient to core antigen. The window period occurs before surface antibodies rise.
3
Differentiate the HBsAg (+) states.
High infectivity is marked by HBeAg (+) and elevated ALT. The inactive carrier state has HBeAg (-) and normal ALT.
HBeAg correlates with viral replication and infectivity, which drives active liver inflammation (elevated ALT).

Key Concept

Interpretation of Hepatitis B serological markers to determine disease phase.
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Topics

Gastroenterology and Hepatology

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