A client who weighs 175 lb (79.4 kg) is receiving aminophylline (Aminophyllin) (400 mg in 500 ml) at 50 ml/hour. The theophylline level is reported as 6 mcg/ml. The nurse calls the physician who instructs the nurse to change the dosage to 0.45 mg/kg/hour. The nurse should:

a) question the order because the dosage is too low.
b) question the order because the dosage is too high.
c) set the pump at 45 ml/hour.
d) stop the infusion and have the laboratory repeat the theophylline measurement.

Answer: a) question the order because the dosage is too low.