Is this tool a diagnostic instrument?

No. The Clinical Frailty Scale is an educational reference tool. It should be used alongside a full clinical assessment by a qualified healthcare professional. It does not replace clinical judgment.

Who developed the Clinical Frailty Scale?

The CFS was developed by Kenneth Rockwood and colleagues at Dalhousie University, first published in 2005 and updated in 2020. It is one of the most widely validated frailty tools globally.

At what age is the CFS applicable?

The CFS is designed for adults aged 65 and older. It is not validated for use in younger adults, and the 2020 version notes it should not be applied to people with stable long-term disabilities (e.g., cerebral palsy) unrelated to aging.

What is the difference between CFS 4 (Vulnerable) and CFS 5 (Mildly Frail)?

At CFS 4 (Vulnerable, renamed Living with Very Mild Frailty in version 2.0) the person does not depend on others for daily help, but symptoms often limit activities and a common complaint is feeling "slowed up" or tired during the day. At CFS 5 (Mildly Frail) slowing is more evident and the person needs help with higher-order instrumental activities such as finances, transportation, heavy housework and medications.

Can the CFS be used for COVID-19 or critical care triage?

The CFS has been used as part of triage frameworks during the COVID-19 pandemic, but its use in this context remains subject to ethical and clinical debate. Any application in critical care triage requires institutional protocols and multidisciplinary oversight.

How often should the CFS be reassessed?

The CFS reflects the patient's usual status in the two weeks prior to illness or admission, not their acute state. Reassessment is recommended whenever there is a significant change in functional status, after rehabilitation, or at each care transition.

Clinical Frailty Scale

Select a patient description to instantly identify the Clinical Frailty Scale score (1–9) and receive brief clinical guidance.

Select Patient Description

Choose the level that best reflects the patient's usual status.

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Select a patient description on the left to view the CFS score and clinical guidance.

Summary

The Clinical Frailty Scale (CFS) is a validated 9-point global assessment tool developed by Rockwood et al. to classify older adults from Very Fit (CFS 1) to Terminally Ill (CFS 9). It is widely used in acute and long-term care settings to guide treatment decisions, prognostication, and resource allocation. This tool provides an interactive reference for clinicians and students — select the description that best fits the patient to reveal the CFS level and brief guidance.

How it works

Read each of the nine CFS descriptions listed on the left panel.
Click the description that best matches the patient's overall functional status.
The right panel displays the CFS score, category label, and a color-coded badge.
Brief clinical guidance and key indicators appear below the score.
Use the Reset button to clear the selection and start over.
Remember: CFS is a global clinical judgment — use all available information.

Use cases

Rapid frailty screening in emergency and acute care settings.
Pre-operative risk stratification for older surgical patients.
Triage support during resource-limited situations.
Teaching medical students and residents about frailty concepts.
Documenting baseline frailty status in geriatric assessments.
Guiding conversations about goals of care and treatment intensity.
Monitoring changes in frailty status over repeated assessments.
Research data collection for studies involving older adults.

Frequently Asked Questions

Last updated: 2026-05-23 · Reviewed by Nham Vu

Clinical Frailty Scale

Select Patient Description

Clinical Guidance

Key Indicators

Summary

How it works

Use cases

Frequently Asked Questions

Clinical Frailty Scale

Use the Clinical Frailty Scale

Select Patient Description

Clinical Guidance

Key Indicators

Summary

How it works

Use cases

Frequently Asked Questions