# Can you solve this drug calculation?

1. Just took my final for Pharmacology. There was a question on there that stumped everyone I talked to.

Order: 0.1mcg in 100mL
Stock: 25mg/hr

We were told that we would not have any drug calculations on test that were not realistic. The answer that I got for this (along with other students I spoke to) was 2,500,000 mL/hr.
Obviously it doesn't matter NOW, because the final is over but it is just eating at me!!!
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Joined: Oct '11; Posts: 9; Likes: 2

3. It may just be me, but the wording of that problem doesn't make much sense.....the ones I usually see are an order of mg (mL)/hr and on hand of mg (mcg) per mL......
Last edit by olliesmommy1005 on Dec 8, '11
4. It was written just like this on the test:

0.1 mcg in 100 mL; give 25mg/hr

(and we were to solve for mL/hr)

Our class has a private FB page so I was planning to let them all know. Apparently half the class was hung up on this 1 single question.
5. I did write that wrong in the first post. Sorry! I'm scatter brained right now cuz I'm very anxious to see what my grade is and if I passed the class.
6. Ok, I've tried a few times and gotten really high numbers (like amounts that shouldn't be given over an hour!)......I'm usually pretty good with the math problems, but I may have to defer to those who are better than me!

Wish I could help more!
7. The answer for the problem as presented here is 2,500,000mL/hr. However, unless you were trying to have your patient explode you'd never administer that much fluid in a week let alone in an hour. There is probably a missing decimal point somewhere in the problem and a missing c between the m and g.
8. That is what we were all saying! They told us there would not be ANY problems that were unrealistic. I saved this one problem for last and spent 30 minutes working on it (converting both ways) and reworking it.
9. Hopefully the instructor will realize that it was THEIR mistake when they are grading the tests and everyone has 2million mL as the answer!
10. Hmm... I wonder if the answer they were looking for was "it comes to 2,500,000 mL/hr, which is obviously wrong, so my next step is to tell the MD to fix the order."

I know they said that all questions would be realistic, but finding errors in med orders and getting them fixed IS a realistic part of med administration. It's more realistic, in a way, than a set of problems where everything is correct and unambiguous...

Put another way, maybe your prof meant "hospital realistic" problems, not "nursing school realistic".
11. Quote from rhymeswithlibrarian
Hmm... I wonder if the answer they were looking for was "it comes to 2,500,000 mL/hr, which is obviously wrong, so my next step is to tell the MD to fix the order."

I know they said that all questions would be realistic, but finding errors in med orders and getting them fixed IS a realistic part of med administration. It's more realistic, in a way, than a set of problems where everything is correct and unambiguous...

Put another way, maybe your prof meant "hospital realistic" problems, not "nursing school realistic".
I think that would be a bit unfair unless specific scenarios regarding this had been discussed.

It sounds like a typo. I'm surprised you don't have someone in your class who would raise their hand during the exam and ask - we always did.
12. Doing the D/H x V

0.1 mcg/25mg x 100 mL got me 0.4 is that wrong??? not even sure I
set it up right
13. Quote from 1969
Doing the D/H x V

0.1 mcg/25mg x 100 mL got me 0.4 is that wrong??? not even sure I
set it up right

Yup that's wrong.

You forgot to convert your mcg to mg (or vice versa... depending on how many decimal points you like to play with)
14. Maybe order and stock are reversed?

25mg/hr seems odd for stock?