Say I backprime a 50 mL antibiotic with NS. So the primary tubing is filled with NS and there's fewer air bubbles in the tubing. If I set the machine at 50 mL, is the amount of antibiotic the patient is getting 50 mL minus the volume in the primary tubing which is filled with NS? So is it better to just prime with the antibiotic and let some medicine drip out to get rid of the air bubbles, flick the tubing until the air bubbles are gone, or backprime with NS? (I am assuming NS is compatible with whatever antibiotic I am give.) And does anyone know approximately how many mL's are in most primary tubing sets? Thanks!