Math for Meds
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IV Flow Rate Equation
An IV is ordered to infuse at a rate of 125 mL/hr using a set calibrated at 10 gtt/mL. What is the flow rate?
(Total Volume X gtt Factor) / Min
 125 mL X 10 gtt /60
 125 X 10 = 1250
 1250 % 60 = 20.8
 = 21 gtt/min

Infusion Time
Calculate infusion time for an IV of 500 mL to infuse at 50 mL/hr
 Infusion Time = volume % mL/hr rate
 500 mL % 50 mL/hr
 = 10 hr

Formulaic Method
The Dr. ordered 30 mEq. The the bottle is labeled 80 mEq per 5 mL. How much do you give?
 D= Desired
 H= Have
 Q= Quantity needed
 30 mEq x 5 mL = 0.375 x 5 = 1.875 = 1.9 mL
 80 mEq

What are the macrodrip set calibrations?
 10 gtt/mL
 15 gtt/mL
 20 gtt/mL

What is the microdrip set calibration?
60 gtt/mL

Convert fractional hour to minutes
The order is to infuse 1000 mL at 75 mL/hr. Calculate the infusion time.
Calculate min by multiplying 60 min by the fractional.
 1000 mL = 13.33 hr
 75 mL/hr
 60 min x .33 hr = 19.8 = 20 min
 Infusion time is 13 hr 20 min.

Completion Time
An IV infusion time is 13 h 20 min. What is its completion time if it was started at 10:45?
Completion time is calculated by adding the infusion time to the time the IV was started.
 10:45 am
 +13:20
 23:65
 change 65 min to 1 hr 5 min = 24:05
 = 00:05 = 12:05 a.m.