Blood specimen collection has the following precautions: 1, in the collection of specimens before there should be a unique identification, the nurse may be based on the clinician’s prescription, to the patient’s bedside specimen collection, generally using two methods, one is the method of wristbands, and the second is to ask the patient himself, the content of such a unique identification should contain the patient’s name, gender, age, hospitalization number, department, bed number, after checking the correctness of the clinical nurse can only be collected from the patient; 3, specimen collection in order not to affect the results of blood transfusion or transfusion tee is prohibited. After checking, clinical nurses can collect specimens from patients only; 2, in order not to affect the results of blood matching, it is prohibited to collect specimens at the end of the patient’s transfusion or infusion tee; 3, the specimen collection adopts anticoagulant blood matching, and the specimens should be gently mixed up and down and inverted after collection; 4, the specimens should be collected and the patients should check the information again, and the specimens will be sent to the transfusion department or the laboratory after the checking is correct. Cross-matching.