Stanford Hospital & Clinics and Lucile Packard Children’s Hospital
Test Name : Von Willebrand Factor Activity Order Code : VWACT
Synonyms: Von Willebrand Factor Activity, LABVWACT,VWACT,VWFACT,RIST,RISTOCETIN COFACTOR,VW activity,VWF Function,VW function
Specimen Type: Platelet-Poor plasma
Container Type: Light-blue-top tube (3.2 % Sodium Citrate)
Required Volume: 4.5ml whole blood(full tube)
Minimum Volume (Pediatric): 2.7mL whole blood(full tube)
Methodology: Automated Latex Enhanced Immunoassay
Standard Run Times: Daily
Turnaround Time: Daily
Special Handling: Within 1 hour of collection, centrifuge tubes as required to obtain platelet poor plasma. Aliquot platelet poor plasma into plastic tubes (2 aliquots). Freeze immediately. Transport Frozen.
CPT Codes: 85245
Causes For Rejection: Clotted, gross hemolysis, improperly filled tube, received thawed
Department: Special Coagulation