Our leaflet emphasises the importance of blood transfusion in modern medicine and the need to understand its long-term impact through this comprehensive study. The factsheet invites healthcare professionals and patients to participate in the registry and emphasises the benefits of collecting high-quality long-term data to improve transfusion practice, patient health and quality of life. It explains the aims of the registry to support medical research, improve patient care and ensure data protection and ethical responsibility. Download our leaflet to promote the key significance of LOS at your institution.