Hemolysis in Serum Samples Drawn by Emergency Department Personnel versus Laboratory Phlebotomists

found when the following parameters were compared: distal arm draw versus antecubital fossa draw (P=0.0054), 22 gauge plastic cannula versus 20 gauge cannula (P=0.0104), less than half-full tube draw versus greater than or equal half-full tube draw (P=0.0159), tourniquet compression time of greater than 2 minutes versus less than or equal 2 minutes (P=0.016), and plastic versus metal cannulas ( P=0.0164). Logistic regression of these data to control for confounding variables demonstrated that the following factors contributed most to causing mechanical hemolysis: drawing from a vein in the distal arm and drawing through a narrower gauge needle. Use of a standardized protocol for blood drawing can reduce the rate of pre-analytic hemolysis by more than 7-fold. Drawing blood from the antecu