von Willebrand Factor Antigen - SDL

Test Information

Name: von Willebrand Factor Antigen

Code: N2233-QD

Sample Type: Plasma

Turnaround Time (TAT): 25 days

Preparation & Notes

Preferred Specimen(s) 1 mL frozen platelet-poor plasma collected in 3.2% sodium citrate (light blue-top) tube Collection Instructions Platelet-poor plasma: Centrifuge light blue-top tube for 15 minutes at approximately 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/uL). Freeze immediately and ship on dry ice. Note: Storage of whole blood at refrigerated temperatures prior to processing may lead to cryoprecipitate formation and falsely low Factor VIII and von Willebrand Factor studies. Methodology Immunoturbidimetric Assay Transport Temperature Frozen