Blood tests do not require fasting, but if you want to check the liver function requires fasting, from 10 pm the night before the test, do not eat or drink until the next morning and do not eat breakfast, go directly to the physical examination center, enjoy a nutritious breakfast after the test, and then start the rest of the test items. In addition to fasting, but also pay attention to a few points: First, within a week before the test should avoid overeating, drinking a lot of alcohol and spicy stimulating food to prevent the stimulation of food to make temporary changes in blood composition, affecting the results of the physical examination. Second, three days before the test should avoid heavy physical labor, intense exercise and highly stressful mental labor, keep the mood relaxed, pay attention to rest. Third, it is best to take a shower and clean before the physical examination so that the site where the blood is drawn prevents infection, and to relax emotionally during the routine blood test.