Math help please

[EDRN-2010]

hello,

i understand how to do the actual math part (i think!) of these calculations but have some other questions. i'd really appreciate any insight you have to offer. tia!!

order: drug x 250 mg supply: drug x vial labeled 500mg. reconstitute with 10ml of compatible duluent and shake well. how many ml will you draw after reconstitution?

my question is what is the final volume after reconstituting? don't the vials say something like reconstitute with 10ml for a final volume of 11.1ml/500mg....i just based my calculation off 10ml and came up with an answer of 5ml but know when you add powder to a liquid it adds some volume.

order: drug y 250mg iv supply: drug y 1000mg vial with directions to reconstitute with 10ml of 9%ns. infuse drug y in 50ml of ns. infuse over 15 min. drop factor 10gtt/ml.

how many ml will you draw from vial?

[color=dimgray]same thing here, do i just assume that drug y when reconstituted with 10ml has a total volume of 10ml making my answer 2.5ml?

calculate ml/hr to set the pump.

i added the 2.5 ml to the total volume so in my math i have 52.5ml in 15 minutes answer 210ml/hr but my friends are saying its less than 10% so my calculation should be based off 50 making the answer 200ml/hr.

iv pump not available, calculate gtt/min

i again based my calculation off the 52.5 ml, and this time others agreed stating they add the amount when calculating manually but omitted with the pump. no explaination given to why and i can't find it in my book. seems confusing! so i am just interest in finding out if there is a right way to do this.

order: digoxin 25/mcg/kg/day every 8 hours supply: digoxin 0.25mg/5ml. child weight 25 pounds. how many ml per dose?

easy question here, i came up with 1.89ml but am unsure if i should be rounding my answer to 1.9ml

order drug g 275 mg iv every 8 hours. supply: drug g 500mg vial. instructions on vial: reconstitute each 500mg vial with 10ml ns. mix in 250ml of ns to infuse over 1 hour.

how many ml will you draw up after reconstitution?

i came up with 5.5ml

how many ml/hr will you set the iv pump?

i added the 5.5 ml to the total volume and did my calculation based off 255.5ml but again my friends are telling me you don't add the ml because they are less than 10%. is it wrong to add it? seems like it would only be more accurate? my friends are telling me i am doing it wrong.

drug b 50mg in 250 ml ns is infusing at 22ml/hr. patient weighs 160lbs. how many micrograms/kg/min is the patient receiving?

i came up with 1.01mcg/kg/min. i use dimentional analysis and came up with 1.0083333 on my calculator, should i have rounded the way i did? maybe i am thinking into it too much, i am just not sure because if i round to 1.01mcg this would convert to 1010 mg (the unit of measure this drug is supplied in) which is not as accurate as 1008, but i have never seen an answer with that many decimal places so i am guessing to use 2 places if not 1.