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Published on January 21, 2026

von Willebrand Factor Ristocetin Cofactor Activity

Tube Type = Gold Top

Tube Type

Test ID LAB5338
EPIC ORDER VON WILLEBRAND FACTOR RISTOCETIN COFACTOR ACTIVITY
CPT Code(s) 85245
Group/Individual Test Individual
Laboratory Special Coagulation
Tube Station 30
Specimen Routine: 3.0 mL blood/light blue sodium citrate tube; See Comments
Stability Unspun - 4 hrs
Room Temp - 4 hrs
Refrigerated - NO
    Frozen - 6 months
Availability Routine: Wednesdays
STAT: NA
Turnaround Time 3-5 Business Days
Reference Range Normal: 55-187%
Comments
  • Deliver Immediately
  • von Willebrand Factor Ristocetin Cofactor Activity is a reflex test ordered on von Willebrand Factor panels if required. 

Reviewed by J. Carr on January 21, 2026

UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514