I have managed to get up to chapter 18 of math for meds until I ran into a problem. I don't actuall start school until tuesday so I don't have a teacher to ask yet. I need to figure out the gtt/min for the following question;
An IV of 500 mL is to infuse at 120 mL/hr using a 20 gtt/mL calibrated set. ( pg 281 math for meds 10th edition)
Using the formula Volume X Set Calibration 120 mL X 20 gtt/min
----------------------- -------------------
Time ( 60 min or less) 60 min
I get a rate of 40 gtt/min. The book shows the answer as 83 gtt/min
I had contacted them about an issue with my cd and by the time I was done I forgot to talk to someone about the errors. I am sure they are already aware.....there I go assuming again...
Emmel is right. You have a total of 500mL to be infused at 120mL/hr or in 60 minutes. Divide 500 by 120 which equals 4.17.Then times that by 20 and you get 83. That is how we learned to do it.
An IV of 500 mL is to infuse at 120 mL/hr using a 20 gtt/mL calibrated set. ( pg 281 math for meds 10th edition)
Sorry for the confusion. 60 minutes is not part of the problem. It says 20gtt/mL or 20gtt per mL. So we have to find the mL to be infused. That is why we divide 500 by 120. That will give you the mL that will be infused 4.17. Then you times 4.17 by 20gtt to get the answer of 83.
Hey guys. The below answer to this question is completely wrong. If you divide (and you always have to make sure that your units are divided as well with the numbers) 500mL by 120mL/ hr it looks like this:
500mL / (120mL/hr)
=4.17hr
So, you see that 4.17 is not the number of mL's that is being infused, it is the number of hours that you will infuse 120mL/hr to achieve the 500mL total that is desired with the stated setting. The math for these 5 problems is incorrect and should be ignored.
John--RN
120 Posts
I had contacted them about an issue with my cd and by the time I was done I forgot to talk to someone about the errors. I am sure they are already aware.....there I go assuming again...