The Severe Von Willebrand Disease (sVWD) Patient Registry

Inclusion Criteria: 1. Anyone meeting the diagnostic classification for von Willebrand disease 2. Any VWF antigen or activity: a. Result \<20% regardless of bleeding phenotype, or b. Result \<30% with excessive bleeding symptoms including: i. Bleeding that resulted in hospitalization, required surgical procedure, red blood cell transfusion, Hemoglobin decrease \>2g/dL, or ii. Intracranial, intraspinal, pericardial, retroperitoneal, intramuscular bleeding with compartment syndrome, or iii. Persistent or recurrent bleeding that is disruptive of work or school. 3. Provide informed consent by participant or legally authorized representative 4. Be willing and able to comply with study procedures and data collection 5. Reside in the United States NOTE: For inclusion criteria 1 and 2, it is not expected that participants will submit evidence of clinical diagnosis at screening; a participant's own confirmation that they have severe VWD will be sufficient for meeting the enrollment requirement and obtaining access to the registry. Laboratory values will be provided during the conduct of the study, and participants with VWF antigen or activity not meeting inclusion criterion 2 may be excluded from data analysis on a case-by-case basis in consultation with a subcommittee of the VWD Connect Foundation Medical and Scientific Advisory Board. Exclusion Criteria: 1\. Have a clinical diagnosis of acquired VWD