Von Willebrand Panel

Test Name

Von Willebrand Panel

LIS Code

VWP

Lab Section

Hematology

Fluid Type

Whole Blood

Test Includes

Factor VIII Assay, Factor VIII Antigen, Ristocetin Cofactor

Specimen Tube Type Transport

Blue Top Tube

Container Whole Blood Required

4 Blue Top Tubes

Summary Test Name

Von Willebrand Panel

Minimum Volume

1.0 ml in each of four aliquots

Specimen Preparation In House

Give the containers to the Coag tech for handling

Stat Availability

Patient Preparation

No Heparin for 48 hours or Coumadin for 2 weeks prior to testing.

Reference Value

Refer to the individual orders.

Additional Test Information

If the Ristocetin Cofactor is normal, a Collagen Binding Assay will be ordered as followup; if the ratio of the Ristocetin Cofactor to the Factor VIII Antigen is <0.5, Von Willebrand Multimers will be ordered