A nurse is reviewing the formulary about NPH insulin before administering the medication to a client. Which of the following information should the nurse expect?

NPH insulin is an intermediate-acting insulin that appears cloudy due to its protamine suspension — this cloudiness is normal and expected. However, if it appears abnormally cloudy, has particles, or is discolored, the vial must be discarded. NPH is administered subcutaneously, not IV. It is given at meal times or bedtime — not specifically 30 minutes before breakfast (that timing is for regular insulin). NPH is not used to treat diabetic ketoacidosis — IV regular insulin is used for DKA.