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Lab Test Dictionary

von Willebrand Disease Panel with Collagen Binding Assay (CBA) (15540)

Synonyms

vWF; von Willebrand Comprehensive Panel 2

Specimen Type

Plasma

Performing Lab

Quest Diagnostics San Juan Capistrano

Epic ID

LAB4384

Collection Information

Specimen Required

(four-five) 1.8 mL or (three-four) 2.7 mL Blood

Container Type

Light Blue (Sodium Citrate)

Processing Information - Lab Use Only

Transport Temperature

Frozen-Only

Specimen Stability

Room Temp: Unacceptable; Refrigerated: Unacceptable; Frozen: 14 Days

Test Volume Required

1 mL (x4) Platelet-Poor Plasma

Minimum Test Volume

0.75 mL (x4) Platelet-Poor Plasma

Processing Instructions

Please submit a separate, frozen vial for each special coagulation assay ordered. Draw blood in a light blue-top tube containing 3.2% sodium citrate, mix gently by inverting 3-4 times. Centrifuge 15 minutes at 1500 g within one hour 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(s). Freeze immediately and transport on dry ice.

Included Tests

Partial Thromboplastic Time, Activated, Factor VIII Activity, Clotting; von Willebrand Factor Antigen, Ristocetin Cofactor, von Willebrand Factor Collagen Binding Assay and von Willebrand Antigen Multimeric Analysis.

Comments

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.