GPT and chronic obstructive pulmonary disease: ALP: Alkaline phosphatase, CKD: Chronic kidney disease, CLD: Chronic liver disease, COPD: Chronic obstructive pulmonary disease, CRP: C-reactive protein, CSF: Cerebrospinal fluid, H/O alcoholism: History of alcoholism, ICU: Intensive care unit, INR: International normalized ratio, PT: Prothrombin time, RBS: Random blood sugar, SGOT: Serum glutamic oxaloacetic transaminase, SGPT: Serum glutamic pyruvic transaminase.