Which test would reveal the presence of Hepatitis B Surface Antigen?

The test that reveals the presence of Hepatitis B Surface Antigen is indeed the Hep B Sur AG (Hepatitis B Surface Antigen). This antigen is a part of the Hepatitis B virus and indicates an active infection. When this antigen is present in the blood, it suggests that the individual is currently infected with Hepatitis B and potentially contagious.

The other tests listed focus on different aspects of Hepatitis B testing. For instance, testing for Hep B Sur AB (Hepatitis B Surface Antibody) would determine whether there is an immune response to the Hepatitis B vaccine or past infection, indicating immunity rather than active infection. Similarly, Hep B Core AB (Hepatitis B Core Antibody) indicates a past infection or current infection but does not specifically identify the presence of the virus itself. Finally, Hep A AB Total refers to antibodies to the Hepatitis A virus and is unrelated to Hepatitis B altogether. Thus, identifying Hepatitis B Surface Antigen specifically points to the presence of the virus, making it a crucial test for diagnosing active Hepatitis B infection.