| Recent changes for Von Willebrand studies |
|---|
| Date | Field | Changed From | Changed To |
|---|
| 14th October 2024 | Assay name | Von Willebrand Factor Antigen | Von Willebrand studies |
| Alternative names | von Willebrand factor, vWF Ag, von Willebrand factor studies | von Willebrand factor, vWF Ag, von Willebrand factor studies, von Willebrand factor activity, Ristocetin activity, collagen binding assay |
| Request Group | VWA, VWR, F8 | VWR, F8 |
| MBS rebatable | No | Yes |
| Registration Instructions | VWA, VWR, F8 TO BE CODED
| VWR, F8 TO BE CODED
|
| Collection & Request Instructions | 2 CITRATE REQUIRED. Usually ordered as part of von Willebrand factor (vWF) studies, which include von Willebrand factor antigen (vWF Ag), FVIII and Ristocetin (RicoF).
If no other tests in vWF studies are ordered, contact request doctor to confirm that no other tests are required. | 2 CITRATE REQUIRED. Usually ordered as part of von Willebrand factor (vWF) studies, which include von Willebrand factor antigen (vWF Ag), FVIII, collagen binding factor and Ristocetin (RicoF).
If no other tests in vWF studies are ordered, contact request doctor to confirm that no other tests are required. |
| Processing Instructions | Centrifuge immediately.
If a tube is collected for vWF RiCoF, this tube needs to be centrifuged twice.
Aliquot all 2 citrate tubes into 2 labelled aliquot tubes and store at -80C. | Centrifuge immediately.
Aliquot all 2 citrate tubes into 2 labelled aliquot tubes and store at -80C. |
| 4th September 2024 | Preferred Container Type | Sodium Citrate | Sodium Citrate x 2 |
| 3rd September 2024 | Preferred Container Type | Sodium Citrate x 4 | Sodium Citrate |
| 3rd September 2024 | Collection & Request Instructions | 4 CITRATE REQUIRED. Usually ordered as part of von Willebrand factor (vWF) studies, which include von Willebrand factor antigen (vWF Ag), FVIII and Ristocetin (RicoF).
If no other tests in vWF studies are ordered, contact request doctor to confirm that no other tests are required. | 2 CITRATE REQUIRED. Usually ordered as part of von Willebrand factor (vWF) studies, which include von Willebrand factor antigen (vWF Ag), FVIII and Ristocetin (RicoF).
If no other tests in vWF studies are ordered, contact request doctor to confirm that no other tests are required. |
| Processing Instructions | Centrifuge immediately.
If a tube is collected for vWF RiCoF, this tube needs to be centrifuged twice.
Aliquot all 4 citrate tubes into 4 labelled aliquot tubes and store at -80C. | Centrifuge immediately.
If a tube is collected for vWF RiCoF, this tube needs to be centrifuged twice.
Aliquot all 2 citrate tubes into 2 labelled aliquot tubes and store at -80C. |