Undiagnosed Day 2026 is a two‑day, clinician‑led meeting in Gdansk (Poland) bringing together specialist clinicians, clinical geneticists and invited experts to support phenotype‑led diagnosis through live case discussion, shared clinical reasoning and practical exchange.
The event is organised by the European Rare Diseases Research Alliance (ERDERA), the Wilhelm Foundation, the Medical University of Gdansk (GUMed), and the University Clinical Centre in Gdansk (UCK).
Although it draws on the same collaborative spirit as international Undiagnosed Hackathons, where patients who have previously failed to receive a diagnosis through standard genetic testing are re-analysed using more advanced techniques, the Gdansk event is designed around specialist clinical assessment and multidisciplinary discussion with patients and families present.
The meeting will focus on practical approaches to phenotyping and diagnosis in undiagnosed conditions, including how to define next steps when a diagnosis remains uncertain, and how to strengthen pathways and collaboration around undiagnosed care.
Registration and more information: