Ristocetin Co-Factor




Test Mnemonic

RISCOF

CPT Codes

  • 85245 - QTY (1)

Aliases

  • Von Willebrand Factor Activity

Performing Laboratory

Cleveland Clinic Laboratories


Specimen Requirements

Volume Type Container Collect Temperature Transport Temperature Special Instructions
Volume2 mLTypePlasmaContainerSodium citrate (Lt. Blue)Collect Temperature Transport TemperatureFrozenSpecial InstructionsPlasma must be frozen within 4 hours of collection.

Minimum Specimen Requirements

Volume Type Container Collect Temperature Transport Temperature Special Instructions
Volume1 mLType Container Collect Temperature Transport Temperature Special Instructions 

Stability

Environmental Condition Description
Environmental ConditionAmbientDescription4 hours
Environmental ConditionRefrigeratedDescriptionUnacceptable
Environmental ConditionFrozenDescription14 days at -20 C; 6 months at -70 C

Days Performed

Mon - Fri

Turnaround Time

1 - 3 days

Methodology

Name Description
NameAggregationDescription 

Reference Range

Ristocetin Co-Factor
Sex Age From Age To Type Range Range Unit
Ristocetin Co-Factor Sex  YearsAge From99 YearsAge ToNormalType42-146Range%

Special Info

3.2% sodium citrate is the preferred anticoagulant recommended by CLSI.

Clinical Info

To be used in the diagnosis of von Willebrand's Disease. For complete evaluation and classification of von Willebrand's disease, suggest ordering the VWF panel. The Ristocetin cofactor assay tests the functional activity of von Willebrand factor.