HalfMoons

Ooooh. Wow. I'm an idiot. For some reason I see all of these #'s and get so confused and my common sense flies right out of the window! Thank you so much!!! :)

I'm having a hard time understanding a certain group of reconstitution problems and my ATI is useless... Here's the question: A patient is to receive 300,000 units of a medication. The reconstitution directions read: 1) Add 5.5 ml to yield a concentration of 600,000 units/mL 2)Add 6.3 ml to yield a concentration od 400,000 units/mL 3) Add 7.6 ml to yield a concentration of 200,000 units/mL Which concentration should the nurse use? Why? I chose #1 and said b/c it's easier to withdraw half of one vial than to withdraw 1/3 or use 2 vials How much sterile water should the nurse add to the vial? I got 2.75mL (i just halfed the 5.5mL for this answer) How many mL should the nurse administer to the patient? I got 0.5mL (i did the D/H x mL, but idk if i'm even supposed to use it for this?!) I have a bunch of these questions and I really think i'm doing them wrong b/c how can what the nurse administers be less than the mL that was added to the reconstitution in the first place?! Am I missing something blatantly obvious (this is a major possibility, which is why can someone please please pleaseee help me!)