The biochemical examination combination, also known as biochemical examination in clinical practice, is currently included in the checkup and is commonly used in clinical practice. It can be used for routine examination during hospital admission, regular review during hospitalization and postoperative follow-up observation. Biochemical combination examination mainly includes liver function, kidney function, blood glucose, lipid analysis, ion analysis, cardiac enzyme spectrum, etc., which can basically reflect the situation of liver, kidney, heart and the internal environment of the body. Liver function mainly includes transaminase, bilirubin, total protein, albumin, alkaline phosphatase, glutamyl transpeptidase, cholinesterase, etc.; kidney function mainly includes creatinine, urea nitrogen, uric acid, etc.; cardiac enzyme profile includes lactate dehydrogenase, creatine kinase and related isoenzymes, etc. When the combination of biochemical tests is more obviously abnormal, it is also necessary to combine the patient’s symptoms, signs and related auxiliary tests to make a comprehensive assessment and judgment, and give timely treatment.