Please help me with an I.V. Calculation. I would be so appreciative.

[mybrowneyedgirl, BSN, RN]

[color=dimgray]we were sent a math-dosage practice exam, but 1/2 the questions were on i.v. calcs. we never learned these so i am trying to teach myself, but i have no way of checking my answers. could someone more experienced than me please check my work and let me know if i am going about this the right way? i would really appreciate it.

problem:

order: 1000 ml .9ns over 10 hours. drop factor 10 gtts/ml. iv was started at 0800. you would give ____ ml/hr. and you would give _____ gtts/min.

my work:

1000 ml/10hr = 100 ml/hr = 1.7 ml/min

10 gtt/1ml = xgtt/1.7 ml, x = 17 gtt/min

problem part 2:

at 12 noon 500 ml infused. is the iv on time? by how much?

my work:

100 ml/1 hr x 4 hr = 400 ml.

500 ml-400ml = 100 ml so it is ahead 100 ml

could someone be so kind as to tell me if i am correct in my answers, and if not, where did i go wrong?

thank you for reading this.

[Daytonite, BSN, RN]

problem:

order: 1000 ml .9ns over 10 hours. drop factor 10 gtts/ml. iv was started at 0800. you would give ____ ml/hr. and you would give _____ gtts/min.

my work:

1000 ml/10hr = 100 ml/hr = 1.7 ml/min

10 gtt/1ml = xgtt/1.7 ml, x = 17 gtt/min

your answer, 17gtts/min, is correct, but the way you went about getting it is incorrect and lucky that you got it right. here is the problem worked by dimensional analysis:

100 ml/hour

(amount to give)

x 10 gtts/ml

(drop factor of iv tubing)

x 1 hour/60 minutes

(conversion factor) = 16.66 gtts/minute, rounded up to

17 gtts/minute

problem part 2:

at 12 noon 500 ml infused. is the iv on time? by how much?

my work:

100 ml/1 hr x 4 hr = 400 ml.

500 ml-400ml = 100 ml so it is ahead 100 ml

if the iv was started at 0800 and was to infuse at 100 ml/hour, then

0800 to 0900 = 100 ml

0900 to 1000 = 100 ml

1000 to 1100 = 100 ml

1100 to 1200 = 100 ml, so that at 1200 400 ml should have been infused

is the iv on time?

no. it is ahead.

by how much?

100 ml