Synonyms
vWF
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
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 Thromboplastic Time, Activated; Factor VIII Activity, Clotting; von Willebrand Factor Antigen; Ristocetin Cofactor; von Willebrand Factor Collagen Binding Assay; von Willebrand Antigen Multimeric Analysis
Comments
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
85730, 85240, 85246, 85245, 83520, 85247
Revised
05-15-19
Initials
SL