# Can Someone explain?

1. Can someone give me a grounded formula that will work for all IV problems?
I know i just posted one before, but i still do not undertsand the formula.

My dosage and calculations book tells me V/T*drip factor=rate
I plug this problem in
You have a new order for 10000 U Hep. in 500 ml NS to infuse at 750 U/hr. The drop factor is 60/gtt/ml. What is the flow rate in gtt/min.

So if i use V/T * drip = rate i get this
500ml/60 minutes * 60gtt/1ml this equals 500 ... that is way too high. What am i doing wrong?

Joined: Nov '07; Posts: 13; Likes: 1

3. Quote from redneckrn2b
Can someone give me a grounded formula that will work for all IV problems?
I know i just posted one before, but i still do not undertsand the formula.

My dosage and calculations book tells me V/T*drip factor=rate
I plug this problem in
You have a new order for 10000 U Hep. in 500 ml NS to infuse at 750 U/hr. The drop factor is 60/gtt/ml. What is the flow rate in gtt/min.

So if i use V/T * drip = rate i get this
500ml/60 minutes * 60gtt/1ml this equals 500 ... that is way too high. What am i doing wrong?
Your "V" figure is wrong. The volume you want to infuse is what contains 750 units of Heparin because that is the dose you desire. To get the volume for 750 units you need to figure out that in 500ml that has 10,000 units of Heparin, 750 units will be in 37.5mL. Plug that figure into your formula.
Then, 37.5mL/60 minutes x 60 gtts/1 mL = 37.5 gtts/minute
4. But how did you get the 37.5 ml for 750 u??
5. 10000 U / 500 ml = 750 / X

Cross multiple and you get 10000X = 375000

375000 / 10000 = 37.5 ml