# Math for Meds

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1. 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
2. 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
3. Formulaic Method

The Dr. ordered 30 mEq. The the bottle is labeled 80 mEq per 5 mL. How much do you give?
• D x Q = X
• H

• D= Desired
• H= Have
• Q= Quantity needed

• 30 mEq x 5 mL = 0.375 x 5 = 1.875 = 1.9 mL
• 80 mEq
4. What are the macrodrip set calibrations?
• 10 gtt/mL
• 15 gtt/mL
• 20 gtt/mL
5. What is the microdrip set calibration?
60 gtt/mL
6. 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.
7. 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.
 Author: misscriss ID: 110369 Card Set: Math for Meds Updated: 2011-10-19 23:17:20 Tags: Formulas meds dosaging Folders: Description: Math formulas for meds dosaging, WCC nursing program Show Answers: