The order reads 40mg, you have 15mg in 5ml suspension. How many cc's?? Please tell me how you got this.. Thanx 0 Likes

Spatialized Specializes in Cardiac Telemetry/PCU, SNF. Nov 30, 2005 The order reads 40mg, you have 15mg in 5ml suspension. How many cc's?? Please tell me how you got this.. ThanxOk, I'll bite...In reality it is simple stuff, perhaps only basic math, but I hope I can explain:40mg is what you need, 15mg/5mL is what you have...40mg * (5ml/15mg) = 13.3 mLmg cancel, leaving you with mL, round the answer as needed, real basic calculations, should be in any nursing calculation book...cheers,Tom 0 Likes

pinefarmgirl Dec 3, 2005 Let me try- I don't know how far along you are, so I'll say it anyway- cc's are the same as ML. next, have you not done any dosage calculation yet?then- we learned these as ratio/proportion problems, and it has always worked for me:you have: 15mg:5ml::40mg:Xmlfirst part what you have, second part what you are looking for, both sides written the same, i.e. mg/ml&mg/ml. X is used to show what you are looking for. ::this symbol means is equal to.Next step is multiply- if the above problem is said to have four components, we can call them A,B,C,D. If the X is in the D position, as it is above, then A is it's opposite, and in this first step you will leave that pair out. so you would start by multiplying 5ml by the 40mg, which is 200. Next step is to divide, and you will divide the number you just came up with, 200, by the number that is left above, which is in the A position in this case. So, 200 divided by 15 = 13.33ml =X. It took me along time in school to get this formula, but once I understood it it has never failed me. I have seen other students which were taught other ways of doing their calculations, and their answers are only right about half the time. This is a great formula. Another way to say it: " I have this many mg in this many ml, (::) which is equal to this many mg in ?ml. Let me know if none of this makes sense, O.K.? 0 Likes

pinefarmgirl Dec 3, 2005 I have no idea where that happy face came from, but a smile is always welcome, huh? 0 Likes

SFCardiacRN Dec 3, 2005 I like to reduce the concentration to milligrams per 1 ML (in this case 3mg/ml) then divide into total milligrams needed. 40mg divided by 3mg = 13.3 ml. 0 Likes

VickyRN, MSN, DNP, RN Specializes in Gerontological, cardiac, med-surg, peds. Dec 3, 2005 I have included an attachment with Word document, showing how to work this out with Dimensional Analysis and Ratio Proportion.Calculation.doc 0 Likes

loriangel14, RN Specializes in Acute Care, Rehab, Palliative. Dec 3, 2005 Using the dose over stock method you would divide 40 by 15 getting 2.666666. Round off to 2.7 and multiply by 5= 13.5. you would give 13.5 cc 0 Likes