VON WILLEBRAND ACTIVITY
| Synonyms: | VWF Activity, Von Willebrand Factor Functional Assay |
| Computer Code: | (VWFACT) |
| Specimen Collection: | 2.7 mL blood (blue top tube). Transport to lab within 3 hours. |
| Minimum Volume: | 1.8 mL |
| Handling Instructions for Offsite Areas: | Maintain at room temperature. If specimen cannot be transported within 2 hours, centrifuge at 3,000 rpm for 20 minutes. Using a plastic pipette, transfer plasma to plastic tube and freeze plasma. |
| Reference Values: | 40-163% |
| Lab Code: | Diagnostic Hematology |
| Requisition: | SPEC H |
| Test Frequency: | weekly |
| Routine TAT: | 7 days |
| Stat TAT: | Must call Hematology lab for stat request. |
| CPT Code(s): | 85397 |
| LCD or NCD: | |
| Methodology Used: |
See Addendum XVII |