von Willebrand Factor Activity Interpreter

Recent ASH/ISTH/WFH guidelines define VWD as VWF:RCo < 30%. Levels between 30% and 50% are categorized as "Low VWF," where patients may still have bleeding risks but may not meet the formal genetic criteria for VWD.

Named after Erik von Willebrand, a Finnish physician who first described the disorder in 1926 in a family from the Åland Islands.