Students General Students
Published May 9, 2005
I've got a peds drug calculation exam this afternoon & I am confused on the rounding for ml. Here is the problem from my practice sheets that I'm working on:
325,000 units per 10 ml. If you need to administer 125,000 units how many ml will you give?
By using ratio & proportion I came up with 3.8461538 .
So how do I round that? Would it be 3.8 ml or 3.85 ml?
I cannot remember the rule for rounding & I can't find it in my notes. Any help would greatly be appreaciated . Thanks a million in advance.
~Alison
ADN Student
flowerchick
111 Posts
Hi! This is my first post here and I've just finished peds this last semester.
My instructor said that we are not to round because different calculators round differently (go figure) We are just to stop at the 2nd number, so your answer would be 3.84 (despite the next number being a 6), But, from a standpoint of drawing it up, 3.85 seems more logical.
Disclaimer: This is what I was taught, but I'd verify with your instructor.
Good luck!
Altra, BSN, RN
6,255 Posts
I agree -- it just depends on what your instructor wants.
But from a practical standpoint, I've never seen a syringe that was more precise than tenths of an mL. Has anyone else?
RoxanRN
388 Posts
I've got a peds drug calculation exam this afternoon & I am confused on the rounding for ml. Here is the problem from my practice sheets that I'm working on:325,000 units per 10 ml. If you need to administer 125,000 units how many ml will you give?By using ratio & proportion I came up with 3.8461538 .So how do I round that? Would it be 3.8 ml or 3.85 ml? I cannot remember the rule for rounding & I can't find it in my notes. Any help would greatly be appreaciated . Thanks a million in advance.~AlisonADN Student
This is how I worked it....
ml = 10ml/325,000 X 125000 = 3.8ml (rounded)
You could draw this up in a 6ml syringe without difficulty. They are calibrated by 2/10th.
See next post for my school's rounding policy.
Roxan
Purpose:
This is the rounding policy used in the first level of the nursing curriculum. When you are calculating the final dosage for each problem, use these guidelines
Oral and Parenteral Medications:
When calculating the final dosage you are going to give the patient, if the number is greater than 1 cc, carry out the answer to the hundredths and then:
When calculating the final dosage you are going to give the patient, if the number is less than 1 cc, carry out theanswer to the thousandths and then:
Weights:
IV Calculations:
When calculating IV drop rates (gtts/min) and ml/r, carry out the answer to the tenths and round to a whole number.
For example, if your answer is 27.7 gtts/min, round it up to 28 gtts/min
For example, if your answer is 25.3 ml/hr, round it to 25 ml/hr
abr
37 Posts
Thanks for the help. I asked my instructor before the exam & she said to just round to the 2nd place. Hopefully I passed, find out tomorrow......
Thanks again,
crb613, BSN, RN
1,632 Posts
Hi! This is my first post here and I've just finished peds this last semester. My instructor said that we are not to round because different calculators round differently (go figure) We are just to stop at the 2nd number, so your answer would be 3.84 (despite the next number being a 6), But, from a standpoint of drawing it up, 3.85 seems more logical.Disclaimer: This is what I was taught, but I'd verify with your instructor.Good luck!
I am also being taught not to round but, to truncate at the hundreds. For my instructor 3.84ml would be correct & 3.85ml would be wrong.
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