What are the precautions for venous blood collection?

Before venous blood collection, it is necessary to select a suitable vein for puncture, try to ensure a successful one-time puncture, and carry out strict disinfection near the puncture point, pay attention to the entire process of aseptic operation to avoid infection. If it is a patient with good blood vessel elasticity, when it is easier to puncture, the angle of the puncture can be raised as much as possible to reduce the pain of the patient. If the blood vessel condition of the elderly is poor and it is difficult to puncture, the angle of the puncture needle can be lowered to increase the success rate of puncture, and attention should be paid when puncturing to avoid puncturing the blood vessel as much as possible to avoid subcutaneous bleeding and congestion. Case. When collecting blood, it is necessary to collect a sufficient amount of blood for testing according to the blood collection tube used and the test items to be carried out, and to avoid blood coagulation and hemolysis in the blood collection tube.