A client receives a prescription for heparin 900 units/hr IV. The IV bag contains heparin 25,000 units in 500 mL of 0.45% normal saline. How many mL/hr should the nurse program the infusion pump to deliver? (Enter numerical value only.)

(Desired Dose * Volume of IV Bag) / (Concentration of Drug in IV Bag * Time) = Infusion Rate. For the given prescription, the calculation would be: (900 units/hr * 500 mL) / (25,000 units) = 18 mL/hr. Therefore, the nurse should program the infusion pump to deliver 18 mL/hr.