von Willebrand Factor Antigen

What it measures

• Von Willebrand Factor AntigenLOINC 27816-8

Specimen

Specimen

1 mL frozen platelet-poor plasma collected in 3.2% sodium citrate (light blue-top) tube

Minimum volume

0.5 mL

Container

Transport tube

Temperature

Frozen

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 (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.

Turnaround

Set up: Wed, Fri

Billing

CPT 85246