Quote from leeniebeanie_2767
Can anyone explain to me this math question? Okay-a physician orders diazepam (Valium) 7.5 mg IV. Diazepam is supplied in a 10 mg (2-ml) Bristojet container. How many milliliters should the nurse administer?
I have the formula: (Desired dose [D]x Quantity [Q]
Dose on Hand [H]
How do you figure the math out? I am really poor in math questions and would appreciate any tips. Thanks!-Aileen:wink2:
I would use Dimensional Analysis
mL= 2mL X 7.5mg / 10mg = 1.5mL
it's very easy once you get the hang of it, always find what unit you want whether it be tabs, mL,mg etc. In this case it was mL. When you know what unit you want you write it, we wanted mL so we would put mL= then the numerator of the ratio we need next must match the unit of measure that you want, thats where the 2mL came in. Then the denominator would be the 10mg contained in the 2mL. The next ratio must have a mg numerator, so you see thats where the 10mg comes in. Can you see the pattern whatever the denominator of the ratio before it is the numerator that follows must match it. since the denominator in the first ratio is 10mg then the next ratio must have a numerator of mg and it did it was 7.5 mg. Then you multiply the numerators, then multiply the denominators(in this case we did not have to) and then divide the numerator answer by the denominator answer and there is the answer.
I am just now teaching this to myself so i explained the best way i know how, sorry if i confused you at all. What i did was went out aad bought a book that teaches me dosage calcualtion and been self studying and once you get the gist of it it becomes very easy to calculate the dosages.