I am a new grad in the nicu. to keep the peripheral line patent an order for 2 units in PF NaCl 0.45% 10mL vial .3-.5 mL IV lock Flush to peripheral line's ordered. Do I or do I not need to mix the heparin with equal parts of normal saline. for example if I use .3 hep then i would also put in .3 normal saline into the syringe and then flush the peripheral line?? if it's the med line on a UVC do I still dilute the hep equally with normal saline? then should i follow that with a 1 mL flush of NS or not?