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Lab Test Dictionary

von Willebrand Factor Antigen (4919)

Methodology

Immunoturbidimetric Assay


Synonyms

vWF

Specimen Type

Plasma

Performing Lab

Quest Diagnostics San Juan Capistrano


Epic ID

LAB01104

Lab Test Days

Monday-Friday

Standard TAT

2-5 Days


Collection Information

Specimen Required

(One) 1.8 mL or (One) 2.7 mL Blood

Container Type

Light Blue (Sodium Citrate)


Processing Information - Lab Use Only

Transport Temperature

Frozen-Only

Specimen Stability

Room Temp: 8 Hour; Refrigerated: 24 Hours; Frozen: 30 Days

Rejection Criteria

Hemolysis; Received room temp; Received refrigerated

Test Volume Required

1 mL Platelet-Poor Plasma

Minimum Test Volume

0.5 mL Platelet-Poor Plasma

Processing Instructions

Platelet-poor plasma: Centrifuge light blue-top tube for 15 minutes at approximately 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 in to a new plastic vial. Plasma must be free of platelets. Freeze immediately and send frozen.


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

85246


Revised

11-07-18

Initials

SL