# Medical Math Help

Posted

I have the answer key to this, and I'm doing fine with everything else but the two piggy back questions have me stumped. I have a test Monday for this and this is the only section I feel unsure about. Can anyone explain to me how to set up the proportion for this?

15. Order: 2 g Keflin IV piggyback in 100 ml D5W over 30 mins.

Specializes in MICU. Has 3 years experience.

Welcome to AN; before we jump in to help you at least tell us how you approached the problem

I had been setting up my proportions by:

mg mg

__=__

X ml/hr

but that obviously doesn't work with this problem. I have searched google for help so even a link that is a tutorial would be wonderful. I'm feel super discouraged. It's been almost a year since I've taken medical math so I am a little rusty :-(. Most of it came back but I'm drawing a blank with this :-(.

The answer on the key is 66.7 mg/min but I have tried several different ways and I haven't gotten anywhere close.

Specializes in MICU. Has 3 years experience.

ok it is not a rocket science..

if the question asks you how many mg/min, then (2g to mg is 2000mg)

so, 2000mg/30min= 66.67

However if the question asks how many ml/min, then it is (100ml/30)=3.3ml/min

The piggy back threw me off and the set up is different than the other questions in this area. Thank you so much, I was getting so frustrated and it just wasn't clicking tonight. They have a few other piggy back practice problems I can try in my study packet, I'm going to attempt the, now, thank you so much again.

Specializes in MICU. Has 3 years experience.

You are welcome, make sure you continue to visit this site because it will really help you in the long run

Specializes in Pedi. Has 10 years experience.

The answer on the key is 66.7 mg/min but I have tried several different ways and I haven't gotten anywhere close.

The question that you posted doesn't say what they are looking for. If the question is how many mg/min and you are giving 2,000 mg over 30 min, it's simple division to get to that answer.