Frailty & Clinical Frailty Scale
Scoring the CFS correctly: baseline, collateral and acute illness
Anchor CFS scoring to the appropriate pre-acute baseline. Take a structured functional history that supports scoring.
Learning objectives
• Anchor CFS scoring to the appropriate pre-acute baseline. • Take a structured functional history that supports scoring. • Use collateral information and records to verify baseline. • Recognise common scoring errors in dementia, acute illness and long-standing disability.
Learner handbook (PDF)
Open source ↗Anchor the baseline
Official CFS guidance emphasises the person’s usual pre-illness state, commonly using approximately two weeks before the acute illness as the anchor. The purpose is to prevent pneumonia, delirium, pain or hospital immobility from being mistaken for chronic frailty. The baseline is a clinical anchor, not a magical date; use the best account of usual pre-acute health and function.
Build the history in layers
Start with mobility and community activity. Then ask about shopping, transport, finances, cooking, medication organisation and housework. Move to personal activities such as bathing, dressing, toileting, transfers and feeding. Ask about cognition, symptoms, falls and trajectory. Clarify what the person does independently, what requires prompting and what requires physical help.
Trust but verify
People may overestimate or underestimate their function; families may do the same. Delirium, memory impairment and social desirability add noise. Verification is therefore good practice, not distrust. Compare the account with carers, therapy notes, previous discharge summaries, community records and observed performance, while recognising that hospital performance may be below baseline.
Dementia and dependence
Do not assign a frailty level simply because dementia is present. Establish how cognition affects everyday activities and personal care. Similarly, do not assume that a person with a stable lifelong disability should be scored using the same logic as age-related deficit accumulation; official CFS guidance explicitly warns about stable single-system disability and developmental delay.
Acute deterioration
Acutely ill people can temporarily appear much more dependent. Record current dependency separately from baseline frailty. This distinction is vital for goals of rehabilitation, discharge planning, prognosis discussions and evaluation of recovery.
A structured scoring note
ClinicalEdu recommends documenting: baseline date/period; mobility; instrumental ADLs; personal ADLs; cognition; living situation; collateral source; current acute change; CFS judgement; and one-sentence rationale. The score should be reproducible from the narrative even if the original assessor is unavailable.
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.
