Quantify physiological reserve in elderly patients.
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The Frailty Index (FI) is a robust geriatric assessment tool designed to quantify an individual's physiological reserve by measuring the accumulation of health deficits. Primarily for clinicians and researchers working with older adults, it provides an objective, continuous score indicating a person's vulnerability to adverse health outcomes. The FI is typically calculated as the proportion of present deficits from a standardized set (e.g., symptoms, signs, diseases, disabilities). Its value lies in enabling personalized risk stratification for hospitalization, institutionalization, and mortality, guiding tailored interventions, and facilitating monitoring of changes in frailty status over time, thereby optimizing patient care.