Solutions
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IVRUS's post in Heparin Drips And Lab Draws was marked as the answerInfusion Nurses Society standards state that an infusion, should be STOPPED prior to drawing labs for at least TWO minutes. Many IV pumps, when put on hold, will beep after two minutes, so that might help.
Also, it isn't best practice to draw coag studies from a lumen that has had Heparin drip, or locking solution in it. A peripheral VP is best. One study showed that if you must draw from said lumen, a 25 cc of waste should be obtained, for accurate results.