Useful For:
Von Willebrand Disease is the most common hereditary bleeding disorder; it may also be acquired. Von Willebrand Factor is necessary for platelet adhesion to injured endothelium. Von Willebrand Factor Antigen is useful in assessing the quantity of von Willebrand Factor. When combined with other tests, results are useful in categorizing the type of von Willebrand Disease.
Methodology: Immunoturbidimetric Assay
Specimen Requirements:
1 blue-top (citrate) tube (minumum: 0.5 mL of the remaining platelet poor plasma separated from 2.7 mL whole blood) drawn following an overnight (8-10 hour) fast. Centrifuge blue-top soon after collection. Separate plasma and FREEZE immediately. Send specimen frozen in plastic vial.
NOTE:
If using a butterfly collection set, fill a 1 mL waste tube prior to blue-top. This ensures full blood volume in blue-top.
Hemolyzed specimens are not acceptable.
Tube must be filled to capacity.
Analytical Time: 3 days
Days Set Up: Monday through Friday
CPT Information:
85246 –