Monarch Disease Ontology term MONDO_0015629 (von Willebrand disease type 2B) is a subtype of type 2 VWD characterized by a bleeding disorder associated with an increase in the affinity of the Willebrand factor (von Willebrand factor; VWF) for platelets. This anomaly results in spontaneous binding of high molecular weight VWF multimers to platelets leading to rapid clearance of both the platelets (increasing the risk of thrombocytopenia) and the high molecular weight VWF multimers from the plasma. Also known as: von Willebrand disease, type 2B.