Aim This study examines the transcultural adaptation and the reliability and validity of the Turkish version of Perroca's Patient Classification Instrument. Background Nurse managers need valid and reliable patient classification tools for determining patients' acuity or dependency levels on nursing care for measuring nursing workloads. Methods This study was conducted in two stages in a private hospital in Istanbul, Turkey. First, the instrument was translated, and its content validation was analysed. In the second stage, data were gathered from 300 hospitalized patients and were analysed by factor analyses, Cronbach's alpha and Cohen's kappa. Results Validity testing with ten experts revealed a scale‐content validity index of 0.93. Exploratory factor analysis revealed a two‐dimensional instrument with distinct factor loadings and a variance of 66.97%. The confirmatory factor analysis revealed that the fit indices were satisfactory. This instrument had an overall Cronbach's alpha coefficient of .86 and Cohen's kappa coefficient of .826. Conclusion The study provides evidence that the Turkish version of Perroca's Patient Classification Instrument is a valid and reliable tool to determine patients' acuity levels on nursing care. Implications for Nursing Management This instrument may be used by nurse managers to determine acuity levels of patients and measure nursing workload.

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