What Matters Ethically About How the UDN Has Changed Since Its Inception?

For persons living with an undiagnosed disease and their families, finding an accurate diagnosis can be a long and complex process. Having a rare condition that goes undiagnosed for a long period constitutes a significant part of these patients' disease burden. This article suggests the importance of international collaborative approaches to rare disease diagnostic practices and describes how the Undiagnosed Diseases Network can draw on best practices and clinical networks to motivate patient-participants' access to rare disease diagnoses.