A scoping review of population-based dementia registries: advancing research, care, and policy

Despite their value for public health, research, and care, population-based registries for Alzheimer's disease and related dementias (ADRD) remain limited. We conducted a scoping review of dementia registry studies through December 2023 and identified population-based dementia registries in Organisation for Economic Co-operation and Development countries. We characterized their structure and scope, assessed key themes, and developed recommendations for registry development. We identified 21 population-based dementia registries from a review of 235 publications. These registries help fill gaps in dementia research by providing longitudinal data, improving case identification, and standardizing outcomes for clinical and policy use. However, many registries lack data on healthcare use and caregiving and have limited geographical coverage, thereby reducing their ability to inform research and public health efforts to address dementia burden in an era of rapidly evolving dementia diagnostics and treatments. As dementia cases rise and advancements in prevention, detection, and treatment accelerate, population-based registries are essential for generating real-world evidence to improve dementia care, policy, and outcomes. HIGHLIGHTS: This scoping review identified 21 population-based dementia registries across OECD countries, highlighting the current landscape and structural gaps. Registries provide critical longitudinal data and standardization for research and policy but often lack information on healthcare use, caregiving, and broad geographic representation. With rising dementia rates and evolving treatments, population-based registries are essential for producing real-world evidence to strengthen care, research, and public health planning.