This non-interventional study (NIS) is designed to collect information on the effectiveness and safety of treatment received in routine clinical care, as well as measure the health-related quality of life (HRQoL) of participants with Type 3 von Willebrand disease (VWD) receiving prophylactic therapy per local standard of care (SOC) over an observation period of at least 24 weeks.

Inclusion Criteria:

• Confirmed diagnosis of Type 3 von Willebrand disease (VWD), based on medical records
• Adequate hematologic, hepatic, and renal function
• Documented and confirmed previous use of SOC prophylactic therapy for VWD (1-3 times weekly, as per prescribed dose) and anticipation to remain on the same regimen during the study
• For participants of childbearing potential: agreement to remain abstinent or adhere to the contraception requirements

Exclusion Criteria:

• Inherited or acquired bleeding disorder other than Congenital Type 3 VWD
• History of gastrointestinal bleeding within 18 months prior to enrollment, or any previous diagnosis of angiodysplasia
• History of intracranial hemorrhage
• Previous or current treatment for thromboembolic disease or signs of thromboembolic disease
• Other conditions (e.g., certain autoimmune diseases) that may increase risk of bleeding or thrombosis
• History of clinically significant hypersensitivity associated with monoclonal antibody therapies or components of the emicizumab injection
• Use of systemic immunomodulators (e.g., interferon) at enrollment or planned use during the study, with the exception of anti-retroviral therapy

This study will observe approximately 40 participants with Type 3 VWD (aged 2 years and older) that are currently being treated with SOC prophylactic therapy.