ED triage of older adults — guides admission vs. observation decisions.
COVID-19 and critical care triage — widely adopted for resource allocation decisions.
Geriatric outpatient assessment to identify patients at risk of adverse outcomes.
Annual frailty screening in primary care for adults ≥ 70.
Rapid Frailty Screening
The CFS can be completed in 2–3 minutes from a brief clinical interview and direct observation. It does not require physical testing equipment, making it ideal for busy acute care and emergency settings.
Section 2
Formula & Logic
9-Point Pictorial Scale
CFS 1 — Very Fit
Robust, active, energetic; exercises regularly
CFS 2 — Well
No active disease symptoms; exercises occasionally
CFS 3 — Managing Well
Medical problems controlled; walks slowly but not daily
CFS 4 — Vulnerable
Not dependent but symptoms limit activities; self-reports slowing
CFS 5 — Mildly Frail
Obvious slowing; needs help with heavy housework, stairs, shopping, bathing
CFS 6 — Moderately Frail
Help with all outside activities and housekeeping; inside limitations
CFS 7 — Severely Frail
Completely dependent for personal care but stable
CFS 8 — Very Severely Frail
Completely dependent; nearing end of life
CFS 9 — Terminally Ill
Life expectancy < 6 months; not otherwise evidently frail
The CFS should reflect the patient's baseline 2 weeks before the acute illness, NOT their current acutely ill state. Acute decompensation may temporarily worsen function; scoring the acute state overestimates frailty and leads to inappropriate withholding of treatment.
CFS vs. Fried Frailty Phenotype
The Fried Phenotype requires grip strength, gait speed measurement, and detailed activity questionnaires. The CFS correlates well with Fried frailty status (r = 0.80) but is far faster to complete. Use CFS for routine clinical use; use Fried for research and detailed phenotyping.
Section 4
Next Steps
Clinical Actions by CFS
CFS 1–3 (Not Frail)
Preventive counselling. Standard surgical/medical care. Annual reassessment.
CFS 4–5 (Pre-frail/Mild)
Prehabilitation before elective surgery. Exercise referral. Nutrition optimisation. Falls prevention.
CFS 6–7 (Moderate–Severe)
CGA. Comprehensive medication review. Goals of care discussion. Geriatric specialist input.
CFS 8–9 (Very Severe)
Palliative care consultation. Advance care planning. Comfort-focused goals.
Section 5
Evidence Appraisal
Primary Reference
A global clinical measure of fitness and frailty in elderly people.
Rockwood K et al. • CMAJ.. 2005;173(5):489–495. Derivation in 2,305 participants from the CSHA; validated for death and institutionalisation at 5 years.
Section 6
Origins
Kenneth Rockwood — Dalhousie University
Developed by Kenneth Rockwood and colleagues at Dalhousie University in Halifax, Canada, as part of the Canadian Study of Health and Ageing (CSHA). The CFS was designed to operationalise the "accumulation of deficits" model of frailty — the idea that frailty is not a single disease but an emergent property of multiple, interacting health deficits. The 2020 update (v2.0) extended it to 9 levels and added the terminal illness category.
