# HELP!! solve math problem

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• Specializes in OR (Scrub Tech/LPN).

Hey thanks for stopping by..I do believe I am reading too much in the problem..here goes..

Calculate mg/hr. A drug of 400mg is ordered. Available: 600mg/4cc, reconstituted with 50ml?? I am not sure where I fit the 50ml in the equation..if it were just 600mg/4cc, not a problem, Am I reading too much? Thank you..this is driving me nuts...

101 Posts

Specializes in rehab, long-term care, ortho. Has 2 years experience.

I think once you reconstitute it is should be 600 mg/50 ml. Then work out the problem.

(Although I'm not sure about that 4 cc; would it then be 600 mg/54 ml? - I've not had it presented that way before)

2,016 Posts

Specializes in Peds/Neo CCT,Flight, ER, Hem/Onc. Has 28 years experience.

I'm thinking the 50ml is what is called a "distractor". It doesn't have a place in the equation. What I'm guessing is the drug is in a 50ml bag with a final concentration of 600mg/4cc. Unless it specifically tells you to reconstitute it. It's an oddly worded question either way. What do you get when worked out with the 600mg/4cc?

No...this doesn't seem right either because the concentration is ridiculous (unless it's supposed to be micrograms) . Can you post the entire question as written?

7,015 Posts

Hey thanks for stopping by..I do believe I am reading too much in the problem..here goes..

Calculate mg/hr. A drug of 400mg is ordered. Available: 600mg/4cc, reconstituted with 50ml?? I am not sure where I fit the 50ml in the equation..if it were just 600mg/4cc, not a problem, Am I reading too much? Thank you..this is driving me nuts...

there is something missing or and error, or both

19 Posts

Specializes in OR (Scrub Tech/LPN).

I think you are correct, it's very confusing. If 600mg/4cc is reconstituted and put in a 50cc bag, wouldn't that mean their is now 600mg in the 50cc bag and that is your concentration? Thank you

19 Posts

Specializes in OR (Scrub Tech/LPN).

Hey, thanks..I called a classmate to make sure I had stated the problem correctly and it is exactly like I had remembered..When I calculated 400mg to be administed from 600mg/4cc, I can up with 2.66cc. I know that's not right..

Wonder if i divided the 4cc into 600 to give me how many mg/cc is where the catch is..thank you for helping..

7,015 Posts

Hey thanks for stopping by..I do believe I am reading too much in the problem..here goes..

Calculate mg/hr. A drug of 400mg is ordered. Available: 600mg/4cc, reconstituted with 50ml?? I am not sure where I fit the 50ml in the equation..if it were just 600mg/4cc, not a problem, Am I reading too much? Thank you..this is driving me nuts...

you need a rate, ie volume over time.....100ml an hour, 50 ml an hour, some such.....

yes the dose 2/3 of 4cc (ml).......4/3x2=2.6666666666 rounded off where ever you are taught....lol...

that is put in the 50 ml "partial fill" bag and then we are back to needing a RATE.....

1,133 Posts

Specializes in SRNA. Has 6 years experience.

What I'm confused about is that the problem says to calculate mg/hr but no timeframe is given.

If you had a drug that's 600mg/4ml and you reconstitute it with 50ml of fluid, you then have 600mg in 54ml of fluid. 400mg would then equal 36ml. But mg/hr? It depends on how fast you give it.

19 Posts

Specializes in OR (Scrub Tech/LPN).

The problem only ask for me to "calculate mg/hr"..sorry, I know it doesn't make sense...thinking back one of the answers I could have chosen was "no answer is correct"..so maybe that's my sign..But thank you for trying to help, as soon as I find the correct answer, I will let ya'll know..(we are taught to take to the hundredths place and DO NOT ROUND!!) lol..you would just have to know my instructor..:)

160 Posts

Specializes in Neonatal ICU. Has 5 years experience.

I wonder if they are asking for mg/ml and everything else is there to distract you?

600mg/4ml = 150mg/ml

Oh, and my nursing school taught us that cc is no longer acceptable due to it being so easily misread as "zeroes" when handwritten..is anyone else being taught this?

7,015 Posts

The problem only ask for me to "calculate mg/hr"..sorry, I know it doesn't make sense...thinking back one of the answers I could have chosen was "no answer is correct"..so maybe that's my sign..But thank you for trying to help, as soon as I find the correct answer, I will let ya'll know..(we are taught to take to the hundredths place and DO NOT ROUND!!) lol..you would just have to know my instructor..:)

19 Posts

Specializes in OR (Scrub Tech/LPN).

Yes, we are taught that way, as well..just hard not to use "cc" after 25 years

I worked it like you did, as well..makes sense but other ways makes sense too. Seems if it is 150mg/ML and you would need to know how many mg are in a 50ml bag. Then calculate the problem BUT the first line of the problem says "calculate mg/hr"...what in the world am i missing here..lol..thanks for your time

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