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4919X: von Willebrand Factor Antigen (4919X) Print View
vWF Ag TURBIDIMETRY  50 - 217  % 

PRIMARY
1 Plasma Citrated 1 (0.5) mL   Frozen - 30 Day(s)/Refrigerated - 24 Hour(s)/Room Temperature - 8 Hour(s)  
ALTERNATE

von Willebrand Disease is the most common hereditary bleeding disorder; it may also be acquired. von Willebrand Factor is necessary for platelet adhesion to injured endothelium. von Willebrand Factor Antigen is useful in assessing the quantity of von Willebrand Factor. When combined with other tests, results are useful in categorizing the type of von Villebrand Disease.

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 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 prior to
processing may lead to cryoprecipitate formation and falsely low
Factor VIII and von Willebrand Factor studies.
Setup Schedule
Sunday-Thursday

Reported (Analytical Time)
Same day

CPT Code
85246

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.






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