What does HBSag indicate in the context of Hepatitis B infection?

HBSAg, or Hepatitis B surface antigen, is a key marker in the diagnosis and monitoring of Hepatitis B infection. The presence of HBSAg in the blood indicates that an individual is currently infected with the Hepatitis B virus. It reflects active viral replication and the potential for disease transmission.

When HBSAg is detected, it confirms that the individual is in an acute or chronic phase of infection. This antigen is an important part of the overall assessment of Hepatitis B status because it can help healthcare professionals determine the best course of treatment and management for the patient.

While HBSAg is not a direct measure of vaccination status or immune response, its presence is a clear indicator of active infection, making it critical in identifying individuals who may need further evaluation or treatment for Hepatitis B.