What is the answer to this question? You have 500ml of D5W with 25,000 units of Heparin added. The drop factor is 60 gtt/min. What should the flow rate be if the patient is to receive 800 units/hr. Formulas: drops/minute = [(# of ml to be infused)*(# of drops in a ml)]/(# of minutes to infuse the above amount) drops/minute = [(# of ml to be infused)*(drop factor)]/(# of minutes to infuse the above amount) drip rate = [(IV fluid ordered)*(drop factor)]/(time frame ordered)