Von Willebrand Factor Antigen
Test Mnemonic
VWF
CPT Codes
- 85246 - QTY (1)
LOINC ®
27816-8
Aliases
- Coagulation Factor VIII Related Antigen
- Factor VIII:R Ag
Performing Laboratory
Cleveland Clinic Laboratories
Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 2 mL | Plasma | Sodium citrate (Lt. Blue) | Frozen |
Minimum Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 1 mL |
Days Performed
Mon - Fri
Turnaround Time
1 - 3 days
Methodology
| Name | Description |
|---|---|
| Latex Immunoassay (LIA) |
Special Info
3.2% sodium citrate is the preferred anticoagulant recommended by CLIS. Order VWF panel for further evaluation and classification.
Clinical Info
Differentiates between Hemophilia A and von Willebrand's disease. Other tests may be necessary (Ristocetin cofactor, ristocetin aggregation, VWF multimers) to diagnose von Willebrand's disease.