The liver and kidney function test is a common clinical test, including liver function and kidney function, and the test method is mainly a venous blood test. The liver is one of the final organs of the human body and has more functions. It is not only responsible for the metabolism of protein, sugar and fat in the body, but also has important roles in secretion, excretion, biotransformation and bilirubin metabolism. Liver function tests include several aspects: 1) protein metabolism, such as serum total protein, albumin, globulin, albumin/globulin ratio, and serum prealbumin; 2) lipid metabolism, such as serum cholesterol, triglyceride, lipoprotein, high-density lipoprotein, low-density lipoprotein, and apolipoprotein; 3) bilirubin metabolism, such as serum total bilirubin, direct 4. serum enzymes and isoenzyme-related tests, such as serum glutamate transaminase, glutamic oxalacetic transaminase, alkaline phosphatase, lactate dehydrogenase, glutamate dehydrogenase, etc. Clinically, increased liver enzymes, such as increased glutathione aminotransferase and glutamic oxalacetic aminotransferase, and decreased total protein and albumin can reflect impaired liver function; increased cholesterol and triglycerides often indicate hyperlipidemia; total bilirubin, direct bilirubin, and indirect bilirubin levels can help determine the type of jaundice. The kidneys are another important organ in the body. Their main function is to produce urine and maintain the balance of water, ions, protein and acid-base in the body. Kidney function tests are mainly glomerular function tests, and common items include serum creatinine, serum urea nitrogen, microglobulin, etc. Among them, serum creatinine level is one of the most sensitive indicators to respond to kidney function damage.