von Willebrand Factor Screen
85730, 85246, 85240, 85245
von Willebrand Factor (vWF) Screening Profile (Esoterix)
Three 1-mL platelet-poor, frozen tubes
Blue-top (sodium citrate) tube
Plasma must be separated from cells within 45 minutes of venipuncture and centrifuged a second time before being placed in plastic transport tubes. Freeze within two hours and keep frozen until testing is performed. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested.
Noncitrated plasma; gross hemolysis; presence of fibrin; clotted plasma