Almost everyone knows that the morning of the blood draw should be fasting, but strictly speaking, before the blood draw should be fasting for 12 hours, that is, after 7 pm the night before should not eat, only allowed to drink a moderate amount of water, and in the three days before the physical examination should pay attention to the structure of the diet. If you eat and drink a lot and consume too much fat and protein, it can cause abnormal lab results. Some people also strictly enforce the fasting rule before the blood draw, and even the medication to control hypertension and diabetes are all stopped. If the condition is mild, sudden discontinuation of medication may not be a problem, but if the condition is severe, it may cause the disease to rebound, such as abnormally high blood pressure, diabetic coma, etc. Therefore, patients with chronic illnesses who have been taking medication for a long time to control their conditions should consult with their doctor about stopping their medication to avoid any unpleasant surprises. Patients with a history of acupuncture need to explain in advance so that the hospital can make special arrangements; Second, attention should be paid after the blood draw 1. Note: Do not rub, so as not to cause subcutaneous hematoma. 2. The duration of pressure should be adequate. The clotting time varies from person to person, and some people need a slightly longer time to clot. So when the skin surface does not seem to bleed immediately stop compression, may not completely stop bleeding, and blood seepage to the subcutaneous cause bruising. Therefore, longer pressure is necessary to stop bleeding completely. If there is a tendency to bleed, the compression time should be extended. 3.After blood sampling, symptoms of dizziness such as dizziness, blurred vision, and weakness should be treated by lying down immediately and drinking a small amount of sugar water, and then proceed to physical examination after the symptoms are relieved. 4.If local bruising occurs, apply a warm towel after 24 hours to promote absorption. Third, the urine test is best to stay in the morning urine Because the morning urine is more concentrated, the detection rate of red blood cells, white blood cells and urine protein and other indicators is relatively high, it is recommended to stay in the morning urine test. But many people are to stay before the urine sample using a large number of water to promote urination, this is very inappropriate, because after drinking a lot of water, urine dilution, red blood cells, white blood cells and urine protein and other indicators of the detection rate may be reduced, thus affecting the reliability of the results. If you find it unacceptable to hold your urine and rush to the physical examination, you can collect your morning urine at home with your own clean container beforehand, but send it for examination within 2 hours to avoid the destruction of cellular components in urine.