Violation
Adequate position of a needle in the lumen of a blood vessel for a venipuncture is confirmed by the
presence of blood upon aspiration
rapidity of filling of the syringe upon aspiration
pain associated with vessel puncture
Adequate position of a needle in the lumen of a blood vessel for a venipuncture is confirmed by the
presence of blood upon aspiration
rapidity of filling of the syringe upon aspiration
pain associated with vessel puncture