Laboratory results in records, such as serum creatinine (SCR, μmol/L), creatinine clearance (CCR, mL/min, estimated according to the Cockcroft-Gault formula9), aspartate transaminase (AST, U/L), alanine transaminase (ALT, U/L) and disease grade [Disease, hepatitis (APRI ≤ 2) = 1, Compensated Cirrhosis (APRI > 2) = 2] have been tested in one week before blood samples were collected. The gene discussed is GPT; the disease is hepatitis A virus infection.