Delayed excretion of bromophthalein is an indicator of abnormal liver function, with increased serum alkaline phosphatase activity, delayed excretion of bromophthalein, decreased plasma albumin prolonged plasminogen time, and elevated indirect bilirubin abnormalities of globulin. Liver function abnormality means that when the liver is damaged by certain pathogenic factors, it can cause the destruction of liver morphology and structure and metabolic abnormality of liver function. What are the preventive methods of liver function abnormality? 1, the mind should be calm. According to Chinese medicine, anger harms the liver, and people with liver damage and liver function abnormalities must be in a good mood and control their anger, or else they will suffer from liver qi stagnation and liver fire, which will aggravate the liver disease. 2. Ensure rest. People with abnormal liver function should not engage in too intense and heavy exercise and labor, otherwise it will aggravate the burden on the liver, which is not good for the condition. 3.Don’t take medicine indiscriminately. Because many drugs have to be metabolized by the liver, and many drugs are harmful to the liver, which will cause drug damage to the liver and aggravate liver injury. 4. Regular checkups. Every half a month or a month to review the liver function, timely grasp of the changes in the condition, to provide a basis for the doctor’s treatment. 5.Diet should be regular and reasonable, i.e. high protein, high vitamin food. Choose high nutritional value of plant or animal protein, such as milk, eggs, fish, lean meat, various soy products. A variety of fresh vegetables, fruits and vegetables rich in vitamins, high nutritional value. 6, quit smoking and alcohol addiction. The establishment of good habits for regular and moderate physical exercise, cadmium exposure to the industrial environment should be closely protected. 7, selenium is known as an important “liver factor”, liver disease patients generally lack of selenium in the body, the degree of selenium deficiency is often proportional to the severity of the disease. The more serious the disease, the lower the blood selenium level.