Specimen Requirements
Title
Von Willebrand Panel
Specimen Requirement
Collect 2 light blue top sodium citrate, tubes must be filled. The sample should be mixed immediately by gentle inversion at least six times to ensure adequate mixing of the anticoagulant with the blood. Centrifuge and pipette plasma into a screw top plastic vial. Centrifuge plastic vial again and pipette 3 mL plasma to a screw top plastic vial, indicate plasma from light blue on the transport tube. Ship on dry ice.
Methodology
Clotting/Platelet Agglutination/Microlatex Particle-Mediated Immunoassay
Stability
Room temp: 4 hours, Refrigerated: Unacceptable, Frozen: 3 months
Reference Range
By Report*
Turnaround
3-5 days performed Monday-Saturday
Clinical Use
Includes: Factor VIII Antigen, Factor VIII Activity, Von Willebrand Factor Activity (Ristocetin Cofactor).
Test Code
VWPW