Liver function test should pay attention to the control of diet and medication before the test, the control before blood sampling, and the care after blood sampling, etc. The main purpose of liver function test is to determine whether the liver metabolism is abnormal through blood sampling. Liver function test is mainly to determine whether there is any metabolic abnormality in the liver by drawing blood and testing liver indexes, and the whole test needs to be carried out under the doctor’s guidance so as to achieve the accuracy of the test. 1. Before the test: Try to have a light diet a few days before the test, prohibit drinking alcohol, stop taking medication, and try not to eat anything after dinner on the day before the test. 2. Before drawing blood: choose fasting in the morning, fasting and water fasting for 8 hours to ensure that the body is in a quiet state, the indicators will be more stable. 3. After the blood draw: within 24 hours after the blood draw, don’t touch water around the puncture and avoid scratching to prevent infection. Doing liver function test will not cause obvious discomfort, basically will not cause obvious side effects, need to be combined with other tests to comprehensively determine the physical condition.