Ristocetin Cofactor

Test Name

Ristocetin Cofactor

Alternate Description

RCF, von Willebrand Factor Activity

Availability

May be drawn anytime as long as specimen is processed and frozen within 1 hour of collection.

Lab Section

Special Hematology

Fluid Type

Plasma

Specimen Tube Type Transport

Sodium Citrate Blue Top

Container Whole Blood Required

4.5 ml whole blood in a Sodium Citrate Blue Top

Summary Test Name

Ristocetin Cofactor

Specimen Preparation Outreach

Spin/separate and freeze. Have lab courier bring dry ice and transport frozen.

Specimen Stability

1 Hour

Minimum Volume

1 ml whole blood in a Sodium Citrate Blue Top

Specimen Transport

Frozen

Specimen Preparation In House

Spin/separate and freeze within 1 hour of collection. Keep frozen until analysis

Reference Value

Male/Female and all ages the same: 0.5-2.0 U/mL