A blood test for liver function requires fasting for at least 6-12 hours. There are many things to be aware of when checking liver function, as many factors can affect the accuracy of the liver function test. Generally, it is best not to take oral medications that are harmful to the liver for a few days before the blood test; the day before the blood test, it is best not to drink alcohol, not to eat a greasy, fried, high-fat, high-protein diet, and to have a good night’s rest and not to stay up all night. When waking up in the morning for blood collection, it is better not to do strenuous exercise. If you have needle or blood sickness during blood collection, you need to say hello to the nurse in advance so as to avoid accidents.