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Zorluk: OrtaGastroenterology and Hepatology

Hepatitis B virus (HBV) serologic testing is crucial for determining a patient's exact infectious status and immunity. Different combinations of surface and core antigens, along with their respective antibodies, reflect specific phases of the disease. Match each HBV serologic profile below to its most accurate clinical interpretation.

  • HBsAg (+), Anti-HBc IgM (+), Anti-HBs (-)Acute Hepatitis B infection
  • HBsAg (+), Anti-HBc IgG (+), Anti-HBs (-)Chronic Hepatitis B infection
  • HBsAg (-), Anti-HBc IgG (+), Anti-HBs (+)Resolved past Hepatitis B infection
  • HBsAg (-), Anti-HBc (-), Anti-HBs (+)Immunity due to Hepatitis B vaccination
  • HBsAg (-), Anti-HBc IgM (+), Anti-HBs (-)Acute Hepatitis B window period

Cevap

Each serologic profile uniquely corresponds to a specific phase of Hepatitis B infection or immunity based on the presence of viral surface antigens (HBsAg) and host antibodies (Anti-HBc IgM/IgG, Anti-HBs).
Accurate interpretation of Hepatitis B serologies requires analyzing three main components. HBsAg represents the actively circulating virus. Anti-HBs represents neutralizing immunity. Anti-HBc represents systemic exposure to the actual virus, where IgM signifies acute, recent exposure and IgG signifies chronic or historical exposure.

Adım Adım Çözüm

1
Evaluate HBsAg status to determine active infection.
Positive HBsAg indicates active (acute or chronic) viral replication. Negative HBsAg indicates immunity, susceptibility, or the window period.
HBsAg is the surface protein of the virus, and its continued presence confirms the virus has not been cleared.
2
Evaluate Anti-HBc (Core Antibody) status.
IgM indicates an acute infection or window period. IgG indicates a chronic infection or a resolved past infection. A completely negative core antibody implies no previous natural exposure.
Core antibodies only develop from natural exposure to the whole viral particle, not from the recombinant surface antigen used in vaccines.
3
Evaluate Anti-HBs (Surface Antibody) status.
Positive Anti-HBs indicates definitive immunity. Negative indicates active infection, susceptibility, or the window period.
Anti-HBs are neutralizing host antibodies that confer long-term protection against the virus.

Anahtar Kavram

Interpretation of Hepatitis B Serologic Markers
Tahmini Süre:1m 30s
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Gastroenterology and Hepatology

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