"The nurse received an order for 20,000 units of Heparin in 500 ml D5W to infuse at 25 ml/hr for your patient in ICU-6. How many units of Heparin should the patient receive in one hour?"

1. 800 units/hr.
2. 1250 units/hr.
3. 1000 units/hr.
4. 900 units/hr.