Blood results that enabled a diagnosis of AVWS
| Results | Patient value | Reference value |
| Prothrombin time (s) | 11.5 | 9.5–12 |
| International normalised ratio | 1.2 | 23–32 |
| Activated partial thromboplastin time (APTT) | 40 | 23–32 |
| APTT ratio | 1.5 | |
| VWF antigen (IU/mL) | <0.02 | 0.5–2 |
| VWF Ristocetin Cofactor (IU/mL) | 0.09 | 0.5–2 |
| Factor VIII (IU/mL) | 1.78 | 0.50–2.00 |
| IgG (g/L) | 4.03 | 6.0–16.0 |
| IgA (g/L) | 0.78 | 0.8–4.0 |
| IgM (g/L) | 0.10 | 0.4–2.0 |
AVWS, acquired von Willebrand syndrome; VWF, von Willebrand factor.