Generally, you can judge whether the liver function is good or not by the results of liver function tests. If all the indicators are within the normal range, it is considered that the liver function is normal; if the indicators are abnormal, it means that the liver function is not good. The core items of liver function tests include alanine aminotransferase, glutamyl transpeptidase, bilirubin and proteins. 1. Alanine aminotransferase: the normal range is 5~40U/L, which is a typical indicator reflecting liver cell damage, and elevated indicators are common in hepatitis, liver cancer, organophosphorus pesticide poisoning and other diseases. 2. Glutamyl transpeptidase: the normal range is 7~45U/L for women and 10~60U/L for men; elevated levels are common in myocardial infarction, myocarditis, cirrhosis, nephritis and other diseases. 3. Bilirubin: it can be divided into total bilirubin, direct bilirubin, etc. Normal adult bilirubin ranges from 3.4 to 17.1 μmol/L, and direct bilirubin ranges from 0 to 6.8 μmol/L. If both of them are elevated at the same time, it is considered to be diseases such as cholelithiasis, cholangiocarcinoma, biliary cirrhosis and so on. 4. Protein: it can be divided into total protein, albumin, etc. Normal adult total protein is 60~83g/L, and albumin is 35~50g/L. Elevated total protein is commonly seen in dehydration, intestinal obstruction or perforation, while decreased total protein is seen in hepatitis, cirrhosis, etc. Elevated albumin is only seen in serious diseases. Elevated albumin is only seen in severe dehydration, while decreased is seen in severe hepatitis, cirrhosis and other diseases. To summarize, it is recommended that patients with abnormal liver function tests need to cooperate with their doctors for further examination to clarify the specific causes.