DOMINÓ Registry: study protocol on mineral and bone disease (DOença MINeral e Óssea) of chronic kidney disease in pediatrics in Brazil.

Introduction: Pediatric patients with chronic kidney disease (CKD) develop mineral and bone disorders (MBD). We do not have Brazilian data that evaluate these outcomes, which can be obtained through epidemiological records.

Objective: To present the DOMINÓ study, which aims to describe CKD-MBD characteristics in Brazilian pediatric patients.

Methods: Retrospective and prospective, multicenter, observational cohort. The retrospective study will analyze data from prevalent patients in 2024, and the prospective study will analyze data from 2025 onwards. Demographic, clinical, laboratory, imaging, and bone biopsy data will be collected from pediatric patients with CKD-MBD < 18 years old with CKD stage 3-5D and kidney transplant recipients. The Ethics Committees of the participating centers approved the study.

Discussion/conclusion: The DOMINÓ study will provide information on the incidence, prevalence, morbidity, treatment results, and mortality of this pediatric disease in Brazil. Future analyses will allow us to identify predictors of response to treatment and improve the care for these patients.