Integrating frailty and acute illness severity scoring for risk stratification in acute geriatric care: Review and practical guide.

Managing acute illness in older populations remains a major challenge because of the complex interplay between multimorbidity and reduced physiological reserve. While conventional acute severity scores (e.g., Sequential Organ Failure Assessment, Acute Physiology and Chronic Health Evaluation, and National Early Warning Score) track acute physiological derangements, they often fail to capture the biological heterogeneity seen in geriatric patients. Frailty provides a vital window into the baseline vulnerability of a patient, yet it remains underutilized in acute triage despite its established prognostic value. Current evidence demonstrates that integrating frailty measures, specifically the Clinical Frailty Scale (CFS), with existing severity scores significantly improves mortality prediction and risk stratification in emergency and critical care. This mini-review explores age-related physiological changes as well as the prognostic limitations of standard severity scores while evaluating their integration with validated frailty tools. To bridge current clinical gaps, we propose a practical 4-step clinical triage algorithm integrating a baseline "Two-Week Rule" CFS with acute severity scores via a synergistic 2 × 2 risk stratification matrix. By identifying distinct clinical phenotypes, this framework guides precise, person-centered triage, ensuring that treatment escalation and critical care interventions remain medically proportionate to an older adult's attainable functional recovery.