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.)

To determine the infusion rate in mL/hr, you can use the following formula: (Desired Dose (units/hr) / Concentration of drug in IV bag (units/mL)) = Infusion rate (mL/hr). For the given prescription of heparin 900 units/hr, and an IV bag containing 25,000 units of heparin in 500 mL of solution, the concentration is 25,000 units / 500 mL = 50 units/mL. Using the formula: 900 units/hr / 50 units/mL = 18 mL/hr.