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We aimed to develop a standardized chart review method to identify drug‐related hospital admissions (DRA) in older people caused by non‐preventable adverse drug reactions and preventable medication errors including overuse, underuse and misuse of medications: the DRA adjudication guide.

The DRA adjudication guide was developed based on design and test iterations with international and multidisciplinary input in four subsequent steps: literature review; evaluation of content validity using a Delphi consensus technique; a pilot test; and a reliability study.

The DRA adjudication guide provides definitions, examples and step‐by‐step instructions to measure DRA. A three‐step standardized chart review method was elaborated including: (i) data abstraction; (ii) explicit screening with a newly developed trigger tool for DRA in older people; and (iii) consensus adjudication for causality …