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von Willebrand Comprehensive Panel 2 [15540X]Test Code
83520, 85240, 85245, 85246, 85247, 85730
Activated Partial Thromboplastin Time; Factor VIII Activity, Clotting; von Willebrand Factor Antigen; Ristocetin Cofactor Activity; von Willebrand Factor Collagen Binding Assay; von Willebrand Antigen, Multimeric Analysis
1 mL (x4) frozen platelet-poor plasma collected in four 3.2% sodium citrate (light blue-top) tubes
0.75 mL (x4)
See individual tests for specific specimen requirements and stabilities.
Platelet poor plasma: Centrifuge light blue-top tube 15 minutes at approx. 1500 x 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 ship on dry ice.
Note: Storage of whole blood at refrigerated temperatures before processing may lead to cryoprecipitate formation and falsely low Factor VIII and von Willebrand Factor studies.
General drawing instructions: Refer to Quest Diagnostics Nichols Institute Directory of Services under Specimen Collection section, Coagulation Testing, for further information on specimen processing.
Room temperature: Unacceptable
Frozen: 14 days
See Laboratory Report
Quest Diagnostics Nichols Institute