Routine blood analysis showed a mild elevation of liver transaminases (aspartate transaminase (AST): 54 U/L, alanine transaminase (ALT): 93 U/L) with no associated cholestasis, normal values of hemoglobin, and 450,000 platelets/μL. Immunology serology showed the presence of hepatitis B surface antigen (HBsAg), hepatitis B e antigen (HBeAg), and immunoglobulin G against hepatitis B core (IgGHBc) antibodies and the absence of HBs and HBe. The gene discussed is GPT; the disease is cholestasis.