vWF Antigen; Multimeric; vWF Multimers; v Willebrand Ag MMA
Quest Diagnostics San Juan Capistrano
(one) 1.8 mL or (one) 2.7 mL Blood
Light Blue (Sodium Citrate)
Room Temp: Unacceptable; Refrigerated: Unacceptable; Frozen: 6 Months
Hemolysis; Received room temp; Received refrigerated
1 mL Platelet-Poor Plasma
0.2 mL Platelet-Poor Plasma
Platelet Poor Plasma: Centrifuge light blue-top tube 15 minutes at approx. 1500 g within 60 minutes of collection. Using a plastic pipette, remove plasma, taking care to avoid the WBC/platelet buffy layer and place into a plastic vial. Centrifuge a second time and transfer platelet-poor plasma into a new plastic vial. Plasma must be free of platelets (<10,000/mcl). Freeze immediately and send frozen.
Storage of whole blood at refrigerated temp prior to processing may lead to cryoprecipitate formation and falsely low Factor VIII and von Willebrand Factor studies.