The supervising nurse is watching nurses prepare medications. Which action by one of the nurses will the supervising nurse stop immediately?

A) Rolls insulin vial between hands
B) Administers a dose of correction insulin
C) Draws up glargine (Lantus) in a syringe by itself
D) Prepares NPH insulin to be given intravenously (IV)

The only insulin that can be given IV is regular. NPH cannot be given IV and must be stopped. All the rest demonstrate correct practice. Insulin is supposed to be rolled, not shaken. Glargine is supposed to be given by itself; it cannot be mixed with another medication. Correction insulin, also known as sliding-scale insulin, provides a dose of insulin based on the patient's blood glucose level. The term correction insulin is preferred because it indicates that small doses of rapid- or short-acting insulins are needed to correct a patient's elevated blood sugar.