cogtags

Hey yall, I have a dumb question. Please forgive me if I am overlooking something obvious. We had pretty much zero exposure to IVs in my nursing program and trying to understand it on my own as a new grad is like reading a foreign language. There are so many tiny nuances that I can't seem to make sense of. If I have a 50cc IVPB of Zosyn set at 40cc VTBI, and it will be the final bag of abx for the patient, how do I make sure the entire bag gets infused without pulling air into the line? (For instance say I restart the pump with a VTBI of 8cc, a slightly lower value than the assumed 10cc remaining, but there is actually only 5cc left due to priming or something.) Since you can't tell exactly how much is left with a glance, how do you give the rest/all of it (before the primary starts again) without accidentally pulling air from the bag? Is it not a big deal to waste the remaining abx? They always taught us that patients need the absolute full course of abx.