![]() ![]() You would take 500 ml of the 50% stock solution and add water (or whatever the problem calls for) to the level of a 1,000 ml. * This fraction is hard to write on this computer.when you write down 1,000 ml x 25 ml/100 ml draw a huge line under this entire thing, and then write 50 ml/100 ml.and divide 50 by 100 first. Tip: Use the same percentages, and plug it into your formula.divide out the denominator first, and then do the rest of the math:ġ,000 ml x 25 ml/100 ml = Amount of stock This type of medication problem is called a two-factor medication problem because the given quantity now contains two parts (a numerator and a denominator) instead of just one part (a. How would you prepare 1,000 ml of a 25% solution from a 50% stock solution? The given quantity (the physician’s order) contains two parts including a numerator (dosage of medication) and a denominator (the weight of the patient). Tip: If you get something like mg, etc.all you do is convert it over to grams and use the SAME formula.Īmount prescribed x strength prescribed = amount of stockĪgain, start out with your order in this sample question: So you write it out: You need 20 grams of sodium chloride to prepare a 100 mL of a 20% solution. The 20% will have the DRUG in it.ġ00 mL (which is your order) x 20 g/100 mL = 20g NCLEX Review: Reconstitution Made Easy - How to easily calculate a reconstitution questionFree drug calculation formulas. ![]() How many grams of sodium chloride would you need to prepare 100 mL of a 20% solution?įirst, you know you'll eventually need 100 mL.so you write that down first., then set up the second half of the problem like a percentage, as 20% of 100 is 20. That's an easy number to pull from a problem:Īmount of solusion x the Strength = The amount of pure drug. I have listed some forumulas to help you and if you know the formula, you cannot possibly screw it up.įirst, you always start out with the ORDER of the physician. My school was very fortunate to teach an entire class just on nursing Math. math is about practice, practice, practice. see post #3 for the list of weblinks:ĭon't give up. The directions for reconstitution are: Add 5mL of diluent for a final concentration of 10mg/1mL. The drug comes in powdered form in a vial containing 50mg. This sticky thread on the general nursing student discussion forum has a list of weblinks to medication calculation websites to help you learn to do drug calculations. Here are 20 math practice questions for nurses. ![]() - new to forum and need a little help with calculation.- need your help with this calculation!.- question? - i have a practice dosage calculation test and i am not sure one of the problems.here are several previous posts involving reconstitution: it would help if you gave an example of a problem so i can show you how to work through a specific problem. ![]()
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