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Bone marrow extraction is done in the form of a bone marrow aspirate. Before performing bone marrow puncture, first explain the meaning of bone marrow puncture to the patient and relieve the patient's nervousness. Generally, the patient's posterior superior iliac spine is taken as the puncture point, the skin is routinely disinfected, sterile gloves are worn, and a sterile hole towel is applied. Extract 2ml of 2 percent lidocaine from a 5ml syringe, infiltrate layer by layer from the skin to the periosteum, after local anesthesia, hold the puncture needle through the skin to the periosteum, penetrate layer by layer, and rotate left and right after reaching the periosteum, so that the bone marrow puncture needle gradually enters the Into the bone marrow cavity, and then use a dry syringe to extract the bone marrow fluid for related examinations. After extracting the bone marrow fluid, the puncture needle should be removed, then the puncture site should be disinfected, covered with gauze, and the patient should lie down and rest for 20 minutes, and the whole process is over.

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