I was just wondering when you flush an ipid, administer med, and flush again...does that med mix with the saline that's in the saline lock? Or is the flush a barrier to what may go into the saline lock next? (if you understand what I'm saying) How much can a saline lock tubing hold? Saline, push med, Saline. For example, Lasix is pushed undiluted. Does it dilute in (saline) that was pushed before the med, and then does it get even more diluted by the saline that is pushed behind the med? Thanks!