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) |
Reference Range
| Von Willebrand Factor Antigen | |||||
|---|---|---|---|---|---|
| Sex | Age From | Age To | Type | Range | Range Unit |
| Days | 1 Days | Normal | 37 - 314 | % | 2 Days | 5 Days | Normal | 50 - 278 | % | 6 Days | 30 Days | Normal | 19 - 269 | % | 1 Months | 3 Months | Normal | 58 - 226 | % | 4 Months | 11 Months | Normal | 33 - 216 | % | 1 Years | 5 Years | Normal | 60 - 131 | % | 6 Years | 10 Years | Normal | 44 - 158 | % | 11 Years | 16 Years | Normal | 46 - 168 | % | 17 Years | 99 Years | Normal | 50 - 173 | % |
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.