Peds Math...help!

203bravo, MSN, APRN · Jul 4, 2015

Look at the 1st part of number 1... the question is how man mLs would you need to add to equal 900 mg.. you already know the stock concentration is 95 mg/mL.. then it's just simple math (you should be able to quickly spot that if there are 1000 mg in 10 mL then the correct answer for 900 mg should be somewhere between 9 - 10 mLs before you even begin the math).

second part... to find the safe range simply multiply the low range number and the high range number by the weight... this is the range for the entire 24 hour period (not each dose).. so you would ask yourself does this dose fall within this range AND does the total for all doses ordered within a 24 hour period fall within this range.

question 2 first part -- exactly the same as above

second part -- to find the amount for the divided doses do exactly like it sounds.. take the dose range and (both high and low) and divide by the number of desired doses.. (3 & 4).

Don't make it harder than it needs to be :) Best of luck.

NicuGal, MSN, RN · Jul 5, 2015

They give you a lot of info, you need to pick out what you need.

Desired dose divided by weight gives you how much per kilo. If it is per DOSE this is your answer, if it is per DAY multiply the answer by how many times per day you are going to give it. This gives you mg/kg/day.

You just have to weed out the numbers you need.

So go ahead and show us your work.

chare · Jul 5, 2015

...you already know the stock concentration is 95 mg/mL.. then it's just simple math (you should be able to quickly spot that if there are 1000 mg in 10 mL then the correct answer for 900 mg should be somewhere between 9 - 10 mLs before you even begin the math).

The initial concentration after reconstitution is 95 mg/ml. As the final concentration (50 mg/ml) for the infusion was included in the information provided to the OP, this is not necessary to solve the problem and is included only as a distractor.

203bravo, MSN, APRN · Jul 5, 2015

The initial concentration after reconstitution is 95 mg/ml. As the final concentration (50 mg/ml) for the infusion was included in the information provided to the OP, this is not necessary to solve the problem and is included only as a distractor.

Yeah - thank you -- sometimes difficult to remember some pieces of the information when you have to keep scrolling up and down when typing a response :)

nurseprnRN, BSN, RN · Jul 7, 2015

The question is, is the dose as prescribed and prepared a safe dose? All you need to do is take the safe range per kg (50 to 200 mg), multiply it by the number of kg (18) to get the 24-hour min and max doses. To get the q6h dose, divide the 24-hr dose by four. Is the prescribed and prepared dose within the safe range? Yes or no?

Is this 900 mg in 25cc safe? Is it less than the recommended 50mg/ml? Yes or no?

Since as as given I can't tell whether the question was asking how many cc of the reconstituted drug was needed: Now draw up the 900mg (you know it's 95 mg/cc, so you can figure out how much is 900 mg). The other info is not necessary to answer this.

Same c the second problem.

imbatz, BSN, RN · Jul 8, 2015

There are a lot of distractors in ped med math questions. Just remember the calculation method you chose (Ration:porportion or formula) and break it down the same way you always have. The only new information in peds is that meds are based on weight in kilograms. Everything else is the same.