IV math question..

Hello Allnurses

Im practicing med math and I cant figure out this type of calculation...

Can anyone help me with these?

Thanks!

Medication order: Cardizem 10 mg/h. Available: 125 mg/100 mL D5W solution. Calculate mL/h flow rate.


medication order: Heparin 2500 u/hr. Available: heparin 20 000 units in 250 mL D5W. At what rate will you set your pump?
You are more likely to get responses if you tell us what you think. What do you already know about figuring out IV meds? From other examples you have done, what are the steps to figuring out the rate?

Quote from anurseatlastYou are more likely to get responses if you tell us what you think. What do you already know about figuring out IV meds? From other examples you have done, what are the steps to figuring out the rate?

Try this formula: Desired/Hand x Volume = Amount

You're doing it correctly. Use the formula Desired(10)/On hand(125) X Volume(100) = Amount(8)It was asking you for ml/h (according to what you wrote) so you got the correct answer with 8ml/h. Looks to me like you don't need the extra help

THANKS so much!

Quote from heartnursingI can do gtt/min and ml/hr but this type of question im not too sure what to find first...Medication order: Cardizem 10 mg/h. Available: 125 mg/100 mL D5W solution. Calculate mL/h flow rate.this is what I had...10mg/125mg x100mlI ended up getting 8 but im not sure 8 of what lol

Everyone does it differently. I prefer to figure how many mg per mL (mg/ml) and then divide the desire by that answer.125/100=1.25mg/mL10/1.25=8ml/hrDimensional analysis makes me want zofran.20,000/250=80u/mL2,500/80=31.25ml/hrI find this easier.

Quote from edgaEveryone does it differently. I prefer to figure how many mg per mL (mg/ml) and then divide the desire by that answer.125/100=1.25mg/mL10/1.25=8ml/hrDimensional analysis makes me want zofran.20,000/250=80u/mL2,500/80=31.25ml/hrI find this easier.

Its funny, in all of my chemistry classes I always used dimensional analysis, but in nursing I always preferred Dose/Have X Volume.

Always break it down to simple terms first. You have 125mg in 100mL... So how many mg do you have per mL? 1.25mg/mL. Now you want 10mg/hr? So 1.25 goes into 10 8 times. mg cancels out so you are left with 8mL/hr.