Volume/Time – IV mL Rate Questions
Given a certain amount of liquid and a time period, what is the necessary IV flow rate in mL/hr? Measurement used when IV regulated electronically by infusion pump.
Formula:

= Y (Flow Rate in mL/hr) 
Example: Infuse 250 mL over the next 120 minutes by infusion pump.

= Y (Flow Rate in mL/hr) 
Convert 120 minutes to hours.
 min → hr ( ÷ by 60 )
 120 min ÷ 60 = 2 hr

= 125 mL/hr 
Example: Ordered 1000 mL D5W IV to infuse in 10 hours by infusion pump.

= Y (Flow Rate in mL/hr) 

= 100 mL/hr 