TEST TOMORROW!! Need Help Desperately!!! Calculating Flow Rate

ACNP 2B S1S2RRR · Jun 17, 2010

I think it's 84 ml/hr.

.1mg/kg/min (weighs 100kg) =6mg/kg/hr (still need to factor in the weight)=600mg/hr.

The physician has ordered 600mg/hr, but how many ml is this?

500mg per 70 ml: 500mg/70ml=600mg/xml

600mg per 84 ml.

This is also 1260gtt/hr, or 21gtt/min.

ACNP 2B S1S2RRR · Jun 17, 2010

But like your instructor said, the drop factor is irrelevant for this problem, but if you needed to know, it's listed at the end of my previous post. you just multiply it by the flow rate.

ACNP 2B S1S2RRR · Jun 17, 2010

if your school library is still open, they usually have medmath books that you can check out to use for review, and they are very helpful, just fyi.

BacktotheBeach, ADN, BSN, RN · Jun 17, 2010

this website is really good!

http://www.dosagehelp.com/

turnforthenurse, MSN, NP · Jun 17, 2010

I got 86mL/hr (after rounding).

Here is what I did:

first find the CONCENTRATION: 0.5g/70mL. Convert g-->mg 500mg/70mL and divide = 7mg/mL.

next find the patient's WEIGHT IN KG: 220lbs/2.2 = 100kg.

ordered is 0.1mg/kg/min.

0.1mg/kg/min x 100kg x 60min = 600 / concentration (which is 7mg/mL) = 85.7mL/hr = 86mL/hr.

aimee_lulu · Jun 17, 2010

When you did the calculation of 500mg/70ml, you said you got 7, but if you didn't round the 7.14, and left it as that, your final answer would come to 84.03 ml/hr. Rounding the 7.14 to 7 gave you a higher outcome, like 86 ml/hr.

ChrissyLove123 · Jun 17, 2010

I got 84mL/hr but then she told me I needed to multiply by the drop factor.

ChrissyLove123 · Jun 17, 2010

so I X by the 15gtt/ml but it cancels out the mL so I had to multiply by the gtt per ml (10:1) but then I was wrong... I dunno what she wants me to do...

RNTutor, BSN, RN · Jun 18, 2010

I got 84mL/hr but then she told me I needed to multiply by the drop factor.

The answer based on the original question is 84 mL/hr. And no, you don't need to use the drop factor at all because the question is asking for ml/hr, NOT gtt/min. So it is as if you were calculating the dosage for an IV pump, in which case the drop factor would be irrelevant. Questions like this are the reason why I like dimensional analysis...you just focus on getting the units to work out right, and you don't have to worry about extra information or when to start rounding!! (BTW, when rounding, always wait to round until the very end in order to get the most accurate answer).

Honestly, seeing nursing students get questions like this makes me mad. :mad: No wonder nursing students tend to either hate math or be scared of calculations! I can't imagine ever seeing an order this complicated in a practice setting. It looks like the instructor just wanted to make it the most complicated, difficult type of question possible, which she accomplished by setting up the problem so that you had to do a million conversions.

When you get to the point where you're comfortable doing math, even problems like this are no problem...but if a teacher is giving them to you saying "You need to be able to do this for clinical setting..." Give me a break. :uhoh3:

TRR8021 · Jun 22, 2010

I also got 84 mL/hr. I used to hate these problems because they can get confusing. Just keep practicing them and you'll get better at it in no time.

Pmusicinhamony · Jul 3, 2010

I didnt start nursing school yet so i dont have anyone to ask or check if i am right but i believe the answer is 84ml/hr. Im not so sure that Im right because I didnt learn this yet as i have never taken dosage calculation but I can tell you how I fig it out.

I first found out how many kg the patient was. 220/2.2 = 100kg.

Next I did this 0.1mg/1kg=x/100kg x=10kg.....

10mg/1min=x/60min x=60mg

1g/1000mg=x/60mg

60mg=1000mg X=0.06g

0.5g/70ml=0.06g/x

x=84..

i might be wrong at firsti got8.4 so hopeu fig it out