| Name | Von Willebrand Screen | ||
| Tube Type | Purple (EDTA) | Blue x 2 (Sodium Citrate) | |
| Reporting Units | % | ||
| Reference Range | VWF Activity | 50 – 200 | |
| VWF Antigen | 45 – 160 | ||
| Availability | Referred to Exeter for analysis. | ||
| Target turnaround time | 28 Days | ||
| Special requirements & notes | Fresh Specimens Required. | ||
| Patient preparation | N/A | ||
| Volume required | 1 x purple tube, 2 x blue tubes, all must be full. | ||
| If delayed transport to lab, store: | Must be received in the laboratory within 4 hours of taking the specimens. | ||
| Factors affecting result interpretation | – | ||
| Time limit for add on test | 4 Days | ||
| Pathology discipline | Haematology | ||
| ‘Lab Tests Online’ link | https://labtestsonline.org.uk/tests/von-willebrand-factor | ||
Von Willebrand Screen, VWF, Von Willebrand Factor
Last updated: July 16, 2021