more dimensional analysis questions

cslxagRN · May 29, 2009

30gm * 60ml / 12.5gm = 144ml / dose

Mamie SN · May 29, 2009

Thanks, I hope I get better @ this--unless it's a VERY simple (1 or 2 factor) I can't seem to figure out what I need to focus on---

appreciate your help

cslxagRN · May 29, 2009

Read the question carefully, you will figure out what you need for dimensional analysis equation. Ignore distract factors.

iteachob, MSN, RN · May 29, 2009

When setting up a DA equation, always start with what they are asking for....in this case "how many mL's will you administer". Next look at your equation and find the factor for mL's (in this case, 60). This number is your numerator. Next look for the factor that goes with the numerator (in this case it is grams, but it could be milligrams or micrograms, depending on the problem). This number becomes your denominator. Now, you will alternate numerator and denominator for the rest of the equation. For example, your denominator is in grams....so the next numerator must be in grams (or will have to be converted to grams). This specific equation will come out looking like this:

mL = 60mL X 30g= 1800 = 144 mL

12.5g 12.5

Do you have the Curren Dimensional Analysis textbook? It explains it well.

iteachob, MSN, RN · May 29, 2009

When setting up a DA equation, always start with what they are asking for....in this case "how many mL's will you administer". Next look at your equation and find the factor for mL's (in this case, 60). This number is your numerator. Next look for the factor that goes with the numerator (in this case it is grams, but it could be milligrams or micrograms, depending on the problem). This number becomes your denominator. Now, you will alternate numerator and denominator for the rest of the equation. For example, your denominator is in grams....so the next numerator must be in grams (or will have to be converted to grams). This specific equation will come out looking like this:
mL = 60mL X 30g= 1800 = 144 mL
12.5g 12.5
Do you have the Curren Dimensional Analysis textbook? It explains it well.

Geez, I'm quoting myself, but:

The first 12.5 is supposed to be under the 60mL......the second should be under the 1800.....I could not get it to look that way when editing.

morte, LPN, LVN · May 29, 2009

Geez, I'm quoting myself, but:
The first 12.5 is supposed to be under the 60mL......the second should be under the 1800.....I could not get it to look that way when editing.

the format here only allows one space between items.....that is why i put in a lot of"."

try the lateral approach ie 60/12.5

Cassaundra · May 29, 2009

Dimentional analysis is ao confusing for some people. Let me see if I can help here....

Order:30g q6h x4

On hand: 12.5g in 60mL

Try this: 12.5/60=30/x Set it up as a fraction then cross multiply and divide.

12.5x=1800 x=144

Hope that makes some sense. Focus on what you have and what you need. The rest is irrelevant.

Dalla · May 30, 2009

mls = 60 mls x 30 gms = 1800 = 144

dose 12.5 gms 1 dose 12.5

chare · May 30, 2009

you might want to visit the following sites.

medication math for the nursing student

tutorial: introduction to dimensional analysis

good luck. :specs:

chenoaspirit, ASN, RN · May 30, 2009

12.5 grams per 60 ml is what you have to work with. 30 grams is the actual dose you need to give. So set it up as an equation...

30 grams (dose to give) 12.4 grams (amount per ml)

------------------------- = ---------------------------

x (you dont know how many mls) 60 ml

then it comes down to

12.5x = 1800

After you do the division, you will have your answer.

for some reason it isnt showing up right on here. It should look something like this...

30 grams/x - 12.5 grams/60 ml

then you will have 12.5x = 1800.