Bone marrow aspiration (bone aspiration) is the extraction of a small amount of bone marrow for examination. Bone marrow fills the bone marrow cavity and the cancellous mesh of the bone and is divided into two types: red and yellow marrow. The red marrow is hematopoietic and the yellow marrow has a large amount of fatty tissue. As we age, the red marrow in the marrow cavity is gradually replaced by yellow marrow. The red marrow is retained in the vertebral canal, sternum, ribs, clavicle, scapula, iliac bone, skull and the cancellous mass of the upper end of the femur and humerus, and is the main hematopoietic organ of the body. Abnormalities in the quality and quantity of blood cells are important pathological changes in hematologic diseases. The common clinical puncture sites are the iliac bone and the sternum. This is a safe site as there are no organs or blood vessels or nerves. What should the patient pay attention to during the bone puncture? First of all, the patient should not be too nervous, because the bone itself has no nerves, so the puncture will not be very painful; however, excessive nervousness can lead to deficiency. The patient should never move while the doctor is operating to avoid breaking the needle. The patient should rest for 20-30 minutes after the puncture. The eye of the puncture should be protected, and the local sterile gauze should be avoided to fall off prematurely, and the patient should not take a bath for 24 hours on the day of the puncture, and should not touch the eye of the needle with his hands. In the eyes of experienced hematologists, bone puncture is a very simple operation, the doctor has to sterilize the skin, wear gloves, lay sterile wipes, extract anesthetic, the real operation on the patient is only half a minute to a minute, within this minute the doctor will be very numb to give the patient a little anesthetic, there is a little bit of pain, but like you play the arm intravenous needle will not hurt much, and then soon in the anesthetized area Then the doctor quickly pulls out the needle, covers it with gauze, covers it with tape, presses it for 5 minutes, and the puncture is over. Many patients are just scared, but before they feel much pain, the doctor informs them that the bone puncture is done. In short, bone puncture is not painful for the patient, and it does not damage the organs or tissues in the body, and it does not harm the person by taking a little bone marrow fluid from the lax part of the bone. Therefore, once this test is needed, the patient should actively cooperate.