Do you have to use a separate syringe for each lumen on a multi-lumen PICC (as in 3 NS prefill syringes, and 3 heparin prefill syringes if flushing a triple-lumen PICC) and, if so, why? Also, if you're just doing the routine flush (no meds), do you need to flush with NS first, or just heparin? I've seen too many variations in this process, and nobody on my floor can give me a clear answer on this. Thanks.