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AIM To develop and psychometrically test the Interpersonal Geriatric care relationship tool. BACKGROUND The quality of nursing care is highly influenced by the quality of the interpersonal care relationship, yet there are no tools available that capture the conceptual breadth of the interpersonal care relationship. DESIGN Instrument development and psychometric testing of the content and construct validity, factor structure and reliability. METHODS A four-phased validation procedure was conducted (January 2016-April 2019): defining the construct measured by the tool, tool development, content validation and psychometric evaluation. RESULTS The 30-item Interpersonal Geriatric care relationship tool was subjected to exploratory factor analysis. Four components (humanization, attentiveness, interest and accessibility) were extracted. The tool demonstrated discriminating power and good internal consistency. Cronbach's alphas for the components ranged between 0.69 and 0.84. CONCLUSION The Interpersonal Geriatric care relationship tool is a valuable measure that can be used by scientists, educators and healthcare professionals to benchmark the interpersonal care relationship culture in hospitals and optimize the quality of care.