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This US study aims to assess hemophilia A patient characteristics and reasons for switching from both patient/caregiver and physician perspectives. For this purpose, this research study will include hemophilia A patients who have switched from an existing therapy to Kovaltry or Jivi. In doing so, real world evidence will be obtained from both patient and physician perspectives offering key insights for effective therapeutic management of patients with hemophilia A and to more fully understand what drives patient switching from a patient perspective and a physician perspective.


Hemophilia A

Recruitment Status


Detailed Description

This observational study consists of a patient and a physician survey. This survey will consist of questions developed by Bayer and submitted to the Steering Committee of the existing registry, ATHN-2. Once enrolled to participate in the ATHN-2 registry and provided consent to participate in the Bayer nested study, patients who have switched from another product to Kovaltry or Jivi within the past 50 weeks or at the time of enrollment will be prompted to answer the additional survey questions. Conclusion of the ATHN-2 registry is scheduled for 2021. Once data is cleaned and locked by the registry, the data will be delivered to Bayer for conduct of our analyses.

Eligibility Criteria

Hemophilia A patients who have switched treatment to treatment with Kovaltry or Jivi within the past 50 weeks, who are enrolled the ATHN 2: Factor Switching Study, and who have consented to participate in the Kovaltry or Jivi specific module will be included in this study.


Intervention Type

Intervention Name


New FVIII products



Min Age

2 Years

Max Age


Download Date

August 25, 2022

Principal Investigator


Primary Contact Information

For more information on this trial, visit


For more information and to contact the study team:

Assessing Physician and Hemophilia A Patient Reasons and Expectations for Switching Treatment to Kovaltry & Jivi: A Nested Study Within an Existing Registry NCT03603275