von Willebrand Factor Screen - LG6378


Sunquest Code:IndivCodes  
Order Instructions:Order Indiv Codes, Outreach clients order: NCBAT
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, VWF activity with reflex to Ristocetin Cofactor Activity).
Turnaround Time:Specimen is accepted and processed 24 hours/day. Tests are performed 2-3 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.
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.


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