| Primary Name | Von Willebrand Factor Antigen |
| Contraction | VWF Ag |
| UAB Procedure Number | 2500390 |
| CPT Code | 85246 |
| Specimen | Collect one (1) blue-stopper tube (3.2% sodium citrate), filled to specified volume. Do not underfill or overfill. |
| Specimen Management | Centrifuge blue-stopper tube within one (1) hour of collection, separate plasma and test or quick-freeze at -70°C. |
| Specimen Accepted | Daily including weekends |
| Test Performed | Call Lab for Information |
| Available Stat? | No. |
| Description | The von Willebrand factor antigen assay is used to diagnose von Willebrand disease as it measures plasma von Willebrand factor concentration. When used in combination with the ristocetin cofactor test, the antigen test helps distinguish von Willebrand disease types 1 and 2. |
| Reference Interval | 50-150% |
| Follow-up Test | *The von Willebrand factor antigen test is usually run together with the ristocetin cofactor test and the factor VIII activity assay, forming the von Willebrand disease profile. |
| Associated With | Bleeding disorders |
| Associated With | Von Willebrand disease |
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