Initial tests include a complete blood count to assess for anemia and thrombocytopenia, liver function testing (aspartate aminotransferase (AST), alanine aminotransferase (ALT), alkaline phosphatase (ALP), bilirubin, and albumin), a coagulation profile (prothrombin time (PT), partial thromboplastin time (PTT), the international normalized ratio (INR)), renal function (blood urea nitrogen (BUN) and creatinine), arterial blood gas, and hepatitis serology. The gene discussed is GPT; the disease is hepatitis A virus infection.