VON WILLEBRAND PANEL

Components
Includes Von Willebrand Factor Antigen, Factor VIII Activity, Von Willebrand Factor Activity (Ristocetin Cofactor)

Specimen Required
Draw blood in two light blue sodium citrate tubes. See appendices for coagulation test collection instructions. Send 3.0 mL plasma (1.5 mL minimum) frozen in a screw-capped plastic vial. CRITICAL FROZEN.

Methodology
Clotting/Platelet Agglutination/Microlatex Particle-Mediated Immunoassay

Stability
Room Temperature: 4 hours; Refrigerated: Unacceptable; Frozen: 3 months

Reference Range
By report

Performed
Monday-Saturday

Turnaround Time3-5 days
Test CodeVWPAR
CPT-4 Code (s)
85240, 85245, 85246
LOINC Codes
Factor VIII Antigen   27816-8  
Factor VIII Activity   3209-4  
Von Willebrand Factor Activity (Ristocetin Cofactor)   6014-5  

Warde
Medical
Laboratory