Loading...
Printed on 4/21/2026
For informational purposes only. This is not medical advice.
The SOF Frailty Index is a brief frailty screening tool based on 3 criteria: unintentional weight loss, inability to rise from a chair five times without using arms, and reduced energy level. It is used as a practical alternative to longer frailty phenotypes in older-adult clinical workflows.
Formula: SOF total = count of 3 frailty criteria present (range 0-3).
SOF Frailty Index was developed and validated in older-adult cohorts as a simplified frailty phenotype alternative.
Higher SOF totals indicate greater frailty burden and support comprehensive geriatric assessment.
Use when a rapid phenotype-style frailty screen is needed in clinic, inpatient, or community settings.
Binary criteria can miss nuanced functional decline and may be influenced by acute illness effects.
For related assessments, see Fried Frailty, FRAIL Scale and Clinical Frailty Scale.
Disclaimer: This tool is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about your health.
Classify robust, pre-frail, and frail states using the 5-criterion Fried frailty phenotype.
GeriatricsScreen frailty using the 5-item FRAIL scale (Fatigue, Resistance, Ambulation, Illnesses, Loss of weight).
GeriatricsAssess frailty using the Rockwood Clinical Frailty Scale (CFS 1–9): Very Fit to Terminally Ill. Used for ICU triage, surgical risk stratification, and goals-of-care discussions in elderly patients.
GeriatricsScreen multidomain frailty using the Edmonton Frailty Scale (EFS), a 0-17 style structured assessment.