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Lab Test Dictionary

von Willebrand Comprehensive Panel (19790)



Specimen Type


Performing Lab

Quest Diagnostics San Juan Capistrano

Epic ID


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


Specimen Stability

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

Rejection Criteria

Received room temp; Received refrigerated

Test Volume Required

(four) 1 mL Platelet-Poor Plasma

Minimum Test Volume

(four) 0.75 mL Platelet-Poor Plasma

Processing Instructions

Platelet poor plasma: Centrifuge light blue-top tube 15 minutes at approx. 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/mcl). Freeze immediately and send frozen.

Included Tests

Partial Thromboplastin Time, Activated; Factor VIII Activity, Clotting; von Willebrand Factor Antigen; Ristocetin Cofactor; von Willebrand Antigen, Multimeric Analysis; Interpretation.


Included in test code 9711CS Bleeding Diathesis Panel. Do NOT order together. Storage of whole blood at refrigerated temp prior to processing may lead to cryoprecipitate formation and falsely low Factor VIII and von Willebrand Factor studies.

CPT Codes

85240, 85245, 85246, 85247, 85730