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Discussion

Help with a Math question

Here the problem:

AN IV of 800mL was to infuse over 8hrs at 20 gtt/min. After 4hr 15min only 300mL have infused. Recalculate the gtt/min rate to complete the schedule. The set calibration is 15 gtt/mL.

Thanks!

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  • Experts
here the problem:

an iv of 800ml was to infuse over 8hrs at 20 gtt/min. after 4hr 15min only 300ml have infused. recalculate the gtt/min rate to complete the schedule. the set calibration is 15 gtt/ml.

well, i like to do dimensional analysis in order to get the gtts/minute on the final answer, but i have to do a little pre-math on this first.

800ml - 300ml = 500ml
left to infuse

8 hours - 4 hours, 15 minutes = 3 hours, 45 minutes
(
or, 225 minutes
) left to get the fluid infused

500ml/225 minutes
(dose desired)
x 15 gtts/1 ml
(drip factor of iv tubing)
= 33.333 gtts/minute
, rounded off to
33 gtts/minute
(there is no such thing as 33.33 drops in real life)

  • Author
well, i like to do dimensional analysis in order to get the gtts/minute on the final answer, but i have to do a little pre-math on this first.

800ml - 300ml = 500ml
left to infuse

8 hours - 4 hours, 15 minutes = 3 hours, 45 minutes
(
or, 225 minutes
) left to get the fluid infused

500ml/225 minutes
(dose desired)
x 15 gtts/1 ml
(drip factor of iv tubing)
= 33.333 gtts/minute
, rounded off to
33 gtts/minute
(there is no such thing as 33.33 drops in real life)

do it the same way! i was lost on the mins. wasnt sure how to place them in the formula. thanks so much!!!!

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