Flow Rate
Doctor orders 500mg DrugG in 100mL NS to infuse over 30 minutes. What is the flow rate (mL/hr)?
100mL / 0.5hrs = 200mL/hr
An IV of 1000mL is running at 100mL/hr.
How many hours will it last?
1000mL/100mL = 10hr
An IV of 2000mL is running at 500mL/hr. How many bags are needed for a 24-hr period?
2000mL/500mL per hr => 4 hrs per bag. Therefore, 6 bags needed.
An IV is being administered at 75mL/hr. What is the gtt/min for a 20 gtt/mL tubing?
(75mL/hr) * 20 gtt/mL * 1hr/60min = 1500gtt/60min = 25 gtt/min
An IV is running at 30gtt/min through a 10gtt/mL tubing. How many mL will be needed for 24 hours?
24hr = 60 * 24 = 1440 minutes. (1mL/10gtt) * (30gtt/min) * 1440min = 4320mL
An IV bag of 1L is running at 75mL/hr with a drop factor of 20 gtts/mL. What is the rate in mL/min?
75mL/60min = ? / 1 min
? = (75mL/60min) * 1min = 1.25 mL/min
Doctor orders 1000mL NS to infuse at a rate of 75mL/hr.
What time will the IV bag need replaced if it was given at 0800H?
1000mL * 1hr/75mL = 13.33 hours = 13 hours and 20 minutes = 1320. 1320 + 0800 = 2120H, which is 9:20pm
A patient is receiving medication from a 500 mL IV bag. Find the total volume infused in 5 hours if the infusion rate is 35mL/hr.
35mL/hr * 5hrs = 175mL
What is the gtts/min rate for a 50mL bag of DrugC if it is to run over 30 min using a microdrip setting?
Microdrip/minidrip = 60gtts/mL. Therefore, 60gtts/mL * 50mL/30min = 100 gtts/min.
How long will a 1000mL bag of D5W last if it is running at 40gtts/min through a 20 gtts/mL clamp?
1min/40gtts * 20gtts/mL * 1000mL = 500 minutes = 8 hours and 20 minutes.
NS 1000mL will run from 700H to 1500H. What is the rate in mL/hr?
1000mL / 8hrs = 125mL/hr
Doctor orders 850mL DrugA at a rate of 75 mL/hr. If the nurse started the IV infusion at 7am on February 17, when will this IV infusion end?
850mL * 1hr/75mL = 11.33hr = 11hrs and 20 min. 1120+0700=1820. Therefore, it will end at 6:20pm on Feb 17
NS 1000mL will run from 700H to 1500H. How much is remaining after 5 hours?
1000mL – (125mL/hr * 5hrs) = 375mL
Doctor orders 1000mL D5W IV. If IV infusion started at 0930H and 15gtt/mL clamp setting was selected, what is the flow rate (gtt/min) if the nurse needs to change the bag at 1530H?
1530-930 = 600, which is 6 hours = 360 minutes. 1000mL/360min * 15gtt/mL = 42gtt/min
DrugD 0.4% 500mL is ordered to run at 30 gtts/min. How long will the bag last if a 15gtts/mL setting is used?
500mL * 15gtts/mL * 1min/30gtts = 250 minutes. = 4 hours and 10 minutes.
Patient needs 500mL D5W over 3 hours. If 15gtt/mL tubing is used, how many mL will the patient receive in one hour?
500mL / 3 hrs = 166.66mL/hr
At 11pm, 35-year old patient started receiving an IV bag of 750mL D5W at a rate of 125mL/hr. What time will a nurse replace the bag?
750mL * 1hr/125mL = 6hours. 2300 + 600 = 2900 = 500 at next day = 5AM next day
Patient requires D5W at 80mL/hr over 8hours and 20 minutes. How much (mL) did this patient receive?
8 hr+20 minutes = 8 +1/3 hrs = 24/3+1/3 hrs = 25/3 hrs
80mL/hr * 25/3 hrs = 666.67mL
NS 1000mL will run from 700H to 1500H. What is the drop factor (in gtts/min) for a 15 gtts/mL clamp setting?
15gtts/mL * 1000mL/8hrs * 1hr/60min = 31.25gtts/min = 31gtts/min
2000 mg of DrugQ is dissolved in a 1L IV bag. The hospital has 20 gtts/mL and 60 gtts/mL drop sets available. If the drop set with the larger drop size is run at 25 drops per minute, how many hours will the bag last?
(1min/25gtt) * (20gtt/mL) * 1000mL *(1hr/60min) = 13.33 hrs = 13 hours and 20 minutes.
You are a technician in St. Humber hospital. You sent one IV bag of DrugT 500mL to fulfill your daily cart at 3pm. If the patient must constantly receive DrugT at very slow pace, what is the rate in mL/hr? (Assume no DrugT leftover)
500mL / 24 hrs = 20.83mL/hr
A physician orders 1300mL D5W/NS IV at 65mL/hr. If IV infusion started at 1930H, when should the nurse change the bag?
300mL * 1hr/65mL = 20hrs. 1930 + 2000 = 3930. 3930 – 2400 = 1530 next day. 3:30pm next day
Doctor orders DrugO IV daily. Pharmacy technician prepares 1000mL D5W/0.45S IV bags with 250mg DrugO every morning. Nurse uses the following setting for IV: 25 gtts/min, 100mL/hr, 15 gtts/mL drop set at the electronic clamp. How much DrugO did this patient receive from 1500H to 0500H next day?
0500 next day = 2900. 2900 - 1500 = 14 hours
250mg/1000mL * 100mL/hr * 14hours = 350mg
Doctor orders 12g Drug F IV daily. Drug F is available in either 750mg in NS 250mL bag or 950mg in NS 600mL bags. What is the gtts/min for a 20gtts/mL tubing if a chosen bag only lasts for 90 minutes?
20gtts/mL * 250mL/90min = 55.55gtts/min = 56gtts/min
Patient usually receives a 1200mL IV bag of DrugK every 6 hours at 25gtts/min flow rate adjusted with 15gtts/mL drop factor. If a nurse mistakenly uses a 10gtts/mL drop set while keeping the same flow rate, how many mL did this patient receive in 2 hours? And how many mL of DrugK remains after 6 hours?
1mL/10gtt * 25gtts/min * 120 min = 300mL. Every 2hr = 300mL, so 6 hrs = 900mL. 300mL still remaining in the IV bag after 6 hours.