von Willebrand Factor Screen


Abbrev Code:IndivCodes   
Order Instructions:Order Indiv Codes
Synonyms:VWF Screen; von Willebrand Screen; VWF Screen (F8, Antigen, Activity); von Willebrand Screen (F8, Antigen, Activity)
Methodology:See individual test listings
Test Includes:Factor 8 activity, 'VWF antigen and a VWF activity assay (VWF activity or VWF activity with reflex to Ristocetin Cofactor Activity).
Turnaround Time:Specimen is accepted and processed 24 hours/day. Tests are performed 1-3 times per week. Results are reported within 2-7 days.
Special Instructions:See individual test codes for billing information. Ristocetin Cofactor Activity is sent to ARUP Laboratories. A reflex Ristocetin Cofactor Activity may not be sent per VWF algorithm and pathologist evaluation. See Associated Links.
Associated Links:

von Willebrand Factor (VWF) Panel Algorithm, von Willebrand Factor (VWF) Screen Algorithm, Specimen Collection and Processing for Coagulation Specimens


Collection Instructions

Specimen:Blood
Optimal Volume:Two 3 mL tubes, each containing 2.7 mL blood; each filled to fill line on the tube.
Minimum\Peds Volume:2.7 mL in a 3 mL tube; filled to fill line on tube.
Container:
Alternate Containers: Blue Na Citrate, 3.2% - fill to fill line on tube
Collection Instructions:See link to Specimen Collection and Processing for Coagulation Specimens.
Causes for Rejection:Underfilled tube or clotted specimens. Hemolyzed, icteric or lipemic specimens.


Processing and Shipping

Specimen Processing:See link to Specimen Collection and Processing for Coagulation Specimens
Shipping Instructions:See link to Specimen Collection and Processing for Coagulation Specimens
Test Performed at or Referral Lab Special Coagulation  (UMMC East Bank)


Interpretive

Reference Range:See individual test listings.
Use:See individual test listings.


Click HERE to Report test errors or omissions.
*If no email program is associated with this computer, please contact:
[email protected] for TestID: 6378"