Is a hypodermic needle necessary to withdraw blood?

From the operation procedure of subcutaneous injection in the textbook "Basic Nursing", we see that it is the operation of withdrawal. But now this routine is gradually being broken, which needs to be known by clinical medical staff.

The evidence is as follows:

1. In the US Centers for Disease Control and Prevention (CDC), it is clearly stated that the vaccine should be injected at the recommended location without the need for "blood recovery", and an overview of evidence-based research is provided. It was pointed out that the "returning blood operation" prolongs the injection time, increases the pain, and reduces the treatment compliance.

2. The National Health and Family Planning Commission issued the "Specifications for Vaccination Work (2016 Edition)", in which the subcutaneous injection involved in the "immunization operation" did not mention the "blood withdrawal operation".

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