A nurse is preparing to administer regular and NPH insulin to a client. Which of the following actions should the nurse take?

D. Drawing the NPH last ensures that it does not contaminate the short acting insulin. The regular insulin should be drawn first. A. Regular and NPH insulin should not be mixed together in a single syringe prior to administration. Mixing them could alter their action profiles and affect their effectiveness. B. While injecting air into the vial before withdrawing medication helps prevent negative pressure and facilitates easy withdrawal of the medication, it should be done for each vial individually, not specifically for the regular insulin vial. C. The medication should be drawn up into the same syringe before administration to the patient.