Dose calculations in FA (b/c I'm a *******)

[Taus]

OK..I'm a ******* and have a pretty basic question..

On page 210 they have the formula for calculating loading dose as: Cp x Vd / f

Is it (Cp x Vd) / f or Cp x (Vd/f) ?

I remember the "PEMDAS" mnemonic from highschool and think its the first way w/ multiplying first....but I'd appreciate if someone could chime in on this.

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[surprisedgirl]

i believe its the first

 

[domer621]

surprisedgirl is correct.

 

[Taus]

hmm...taking a look at some practice questions Qbook has it the 2nd way and Katzung in the Lange Qbook has it the first way....wtf...

 

[surprisedgirl]

i havent studied that stuff nor have i looke dat it since last year but im pretty sure thats how i remember it.....and that seems right anyway

 

[mountainman123]

Yeah I remember trying to figure that out and they both give the same answer if you plug in fake numbers and solve (I think...... too lazy to do it right now)

 

[lord_jeebus]

Either

 

[Taus]

thanks

 

[joe6102]

Is it (Cp x Vd) / f or Cp x (Vd/f) ?

Yes.

 

[SeventhSon]

it so happens for that expression a x b / c the order of operations is irrelevant

 

[myershurt]

exactly as above - mathematically speaking - multiplication and division can be used together in any order - just plug in random numbers and you will see that the dose comes out exactly the same no matter which operation you do first...