IV FLOW RATE CALCULATIONS – Flashcards
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ex 125 mL/hr, with use of electronic infusion devices that can be set to deliver a mL/hr rate
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IV FLUIDS ARE ORD. ON THE BASIS OF Ml/HR
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involves converting an mL/hr order to the gtt/min rate necessary to infuse it ...ex. 1000mL to infuse at 125ml/hr or 3000ml/24h
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the most common flow rate calc is necessary when an infusion is not being used
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set up as: 2000 mL/12x60/10 gtt/mL = 27.8= 28 gtt/ml
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An IV of 2000 mL is to infuse in 12 hr using a 10gtt/ml set
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put the 500ml out of mind... do 120/60= then x 20 = 40 gtt /min
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confusing: An IV of 500 ml is to infuse at 120 mL using a 20 gtt/ml set
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ex. 20 gtt/mL= 3 (60/20=3)
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****The division factor can be obtained for any IV set by dividing 60 by the calibration of set
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I assumed there were 60 minutes and did the equation that way . 200ml/60 x 15= 50 gtt/min
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Confusing: A 200 mL rate using a 15 gtt/ml set.
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either 10, 15, 0r 20 gtt/ml
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all macrodrip infusion set (above examples) have the same calibrations
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when a 60 gtt/ml is used , the flow rate in gtt/min is identical to the volume in mLhr to be infused. ex: 120ml/hr= 120 gtt/min (120/60=2x60=120 gtt per min
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MICRODRIPS are 60 gtt/ml
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the roller clamp is adjusted during the count until required rate has been set. A 15 sec count is most commonly used because there is less chance of attention wandering during the count. ****this means the ord. drop must be divided by 4 to obtain the 15 sec drip count (60/4=15sec)
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Manual flow rates are regulated by counting (with a watch)the # of drops falling in the drip chamber.
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do 60/4= 15 gtts/15 sec (ex2. 70gtt/4= 17.5=18gtt/15 sec (***DONT FORGET TO WRITE GTT/15SEC!!!!
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see above.. ex: An IV is to run a rate of 60 gtt/min. What will the 15 sec count be.
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a 15 sec count requires /4, so 30 sec count requires/2
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15sec an 30sec flow rates
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fractions of hrs are used. 15min= 0.25hr, 30min=0.5hr and 45min=0.75hr
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Correcting off schedule rates
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time remaining: 10-5hr=5hr volume remaining: 1000 mL -650 mL = 350ml 350ml/5hr= 70 hr /ml set calibration: 15gtt/ml 70/4 (division factor 60/15=4)= 17.5=18 gtt/min slow the rate from 25gtt/min to 18 gtt/min !!!don't have to change to min!!!!
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*** An IV of 10000 ml was ordered to infuse over 10 hrs at a rate of 25gtt/min. The set calibration is 15gtt/min. After 5 hr a total of 650 mL have infused instead of the 500 mL that was ord. Recalculate the new gtt/min flow rate to complete the infusion on schedule.
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the infusion time is calculated by dividing the volume to be infused by the mL hr flow rate
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Calculating infusion time from mL/hr ordered
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ex. calculate the infusion time for an IV of 500 mL to infuse at 50 mL hr. anser is 10 hr
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infusion time=volume /mL/hr rate
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An IV of 900 mL to infuse at 80 mL/hr 900/80=11.25 answer is written as 11hr15min
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ANOTHER EXAMPLE
