A physician orders 1,000 units of IV heparin to be infused over 2 hours. The pharmacy sends 10,000 units in 500 mL of 0.9% NaCl. The nurse would set the pump to administer how many mL/hr?

Number 2 is correct.

To determine the amount of mL per hour, use the formula: (order/units available) × (amount of fluid in bag/number of hours) . Substitute values and solve: = 1,000 units/10,000 units × 500 mL/2 hrs . = 0.1 × 250 mL/hr . = 25 mL/hr .