Chronic kidney disease (CKD) in children, from birth to late adolescence, is a unique and highly challenging condition that requires epidemiological research and large-scale, prospective cohort studies. Since its first launch in 2007, the European Society for Paediatric Nephrology/European Renal Association (ESPN/ERA) Registry has collected data on patients on kidney replacement therapy (KRT). However, slowing the progression of CKD is of particular importance and thus the possibility to extend the current registry dataset to include patients in CKD stages 4-5 should be a priority. A survey was sent to the national representatives within the ESPN/ERA Registry to collect information on whether they are running CKD registries. All the representatives from the 38 European countries involved in the ESPN/ERA Registry participated in the survey. Eight existing CKD registries have been identified. General characteristics of the national registry and detailed data on anthropometry, laboratory tests and medications at baseline and at follow-up were collected. Results provided by this survey are highly promising regarding the establishment of an ESPN CKD registry linked to the ESPN/ERA KRT registry and subsequently linking it to the ERA Registry with the same patient identifier, which would allow us to monitor disease progression in childhood and beyond. It is our belief that through such linkages, gaps in patient follow-up will be eliminated and patient-centred outcomes may be improved.

Amsterdam Public Health Research Institute Quality of Care Amsterdam The Netherlands

Department of Medicine University of Udine Udine Italy

Department of Nephrology and Transplantation Children's Health Ireland and University College Dublin Dublin Ireland

Department of Pediatric Nephrology School of Medicine Gazi University Ankara Turkey

Department of Pediatric Nephrology School of Medicine University of Belgrade University Children's Hospital Belgrade Serbia

Department of Pediatric Nephrology University Pediatric Hospital Sofia Bulgaria

Department of Pharmacy Oslo University Oslo Norway

ERA Registry Department of Medical Informatics Amsterdam UMC location University of Amsterdam Meibergdreef 9 Amsterdam The Netherlands

ESPN ERA Registry Department of Medical Informatics Amsterdam UMC location University of Amsterdam Meibergdreef 9 Amsterdam The Netherlands

Norwegian Renal Registry Department of Transplantation Medicine Oslo University Hospital Rikshospitalet Oslo Norway

Paediatric Nephrology Service Hospital La Paz Madrid Spain

Pediatric Center Institute of Clinical Medicine Vilnius University Vilnius Lithuania

Pediatric Nephrology Unit Department for Women's and Children's Health University Hospital of Padova Padova Italy

Pediatric Nephrology Unit Hospital de Dona Estefania Centro Hospitalar Universitário Lisboa Central Lisboa Portugal

University Hospital Prague Department of Pediatrics Children's Hospital Motol Prague Czech Republic

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