Frailty & Clinical Frailty Scale
Frailty identification tools: choosing the right instrument
Differentiate population case-finding, diagnostic confirmation, bedside judgement, physical performance and multidomain assessment. Explain the appropriate role and limitations of the eFI.
Learning objectives
• Differentiate population case-finding, diagnostic confirmation, bedside judgement, physical performance and multidomain assessment. • Explain the appropriate role and limitations of the eFI. • Recognise why performance tests may be misleading during acute illness. • Select a tool that matches the clinical question and setting.
Learner handbook (PDF)
Open source ↗Start with the task
The most common tool error is choosing an instrument because it is available rather than because it answers the question. Population risk stratification, bedside global judgement, physical performance, rehabilitation tracking and multidomain assessment are different tasks. ClinicalEdu therefore teaches tool selection before tool scoring.
Electronic Frailty Index
The eFI uses routinely coded primary-care data and a cumulative-deficit approach to identify populations at increased risk. NHS England explicitly describes it as a risk-stratification tool rather than an individual diagnostic tool. A high eFI should trigger clinical validation; it should not be batch-translated into a bedside diagnosis without assessment.
Physical performance tools
Gait speed and Timed Up and Go can provide useful functional information in suitable settings. NICE advises caution when assessing frailty in someone who is acutely unwell and specifically advises against physical performance tools for frailty assessment during acute illness. A poor result during pneumonia may measure the pneumonia as much as baseline vulnerability.
Global clinical judgement tools
The CFS is a judgement-based global scale intended to summarise overall fitness/frailty after assessment. It is not a questionnaire and should not be reverse-engineered from age or a diagnosis list. Modules 4-7 provide detailed training while permission for direct reproduction of the tool is pending.
Multidomain and complementary tools
The PFFS offers a multidomain pictorial approach and HABAM focuses directly on balance and mobility. These can complement rather than compete with a global frailty judgement. Their role depends on the question: a rehabilitation team may need repeated mobility measurement even when a frailty category is already known.
Tool selection as clinical reasoning
Ask five questions: What is the decision? Is the person acutely unwell? Is the task population-level or individual? Is the outcome a frailty construct or a direct domain such as mobility? What action follows the result? If the final question has no answer, collecting the score may add documentation without adding care.
Reflection prompt
What will you do differently when you next assess an older person whose current function differs from their usual baseline? Record one specific change in history-taking, documentation, tool use or multidisciplinary communication.
