What do you do if your pt has a picc line or central line and you need to get AM labs from the line but they are on high doses of levophed or any other vasopressor? Are you supposed to put all IV fluids on hold while you draw labs so they dont dilute the lab sample.. what if your pt is very sensitive to the vasopressor and drops their pressure right away? But what if you leave the pressors on will it mess up the lab results? Please help..I need advice.