The blood test is necessary to know what items to check, different items, the attention is different. If you want to have a simple blood test, there is nothing special to pay attention to, you can come to the test at any time. If the blood test requires fasting, then the day before preparation is not to eat too greasy, high protein food, too spicy food, avoid drinking a lot of alcohol, and then also avoid eating food with high sugar content. Do not drink, eat or eat anything after 8:00 pm before the blood test, and keep an empty stomach for 12 hours before the blood draw. It is also important to wash your hands and arms before the blood draw, so that the disinfection will be cleaner and more thorough when the blood is drawn to avoid wound infection.