<prompt> Marker for active HBV ?HBsAgHBcAgJgM anti HBSAgIgG anti HBSAg  <response>: Davidson;s principles and practice of medicine 22nd edition. HBs Ag is an indicator of active infection and a negative test for HBs Ag makes HBV infection very unlikely.HBcAg is not found in blood but antibody to it appeared in the blood. 