Synopsis
Recognise frailty as reduced physiological reserve, select and interpret an appropriate validated tool, protect the distinction between stable baseline and acute illness, and use results to trigger proportionate CGA rather than ration care.
- Frailty is a dynamic state of vulnerability after a stressor caused by reduced reserve across multiple systems; it is distinct from chronological age, comorbidity and disability.
- First-line recognition in routine care may use gait speed, Timed Up and Go, self-reported health or an electronic frailty index; an abnormal screen should trigger assessment, not become the diagnosis alone.
- The Clinical Frailty Scale is a global clinical judgement anchored to mobility, function and cognition in the stable baseline state, usually about two weeks before acute illness.
- CFS 1–3 covers very fit to managing well, 4 vulnerable, 5 mildly frail, 6 moderately frail, 7 severely frail, 8 very severely frail and 9 terminally ill.
- CFS 9 means terminal illness with life expectancy below about six months without otherwise evident frailty; it is not simply the highest dependency category.
- Use trained judgement and collateral examples of ADLs and IADLs. Do not infer a score from appearance, age, diagnosis count or walking aid alone.
- CFS is principally validated in adults aged 65 and over. Use caution or another approach in stable disability where dependence is not acquired age-related decline.
- Frailty predicts risk at population level but cannot determine whether a particular antibiotic, operation, ICU admission or rehabilitation attempt will benefit one person.
- An identified frailty state should prompt CGA, medicines and falls review, resistance and balance activity, nutrition assessment, vaccination and anticipatory planning.
- Repeat scoring after recovery when baseline was uncertain; worsening function is a clinical signal requiring diagnosis and rehabilitation rather than automatic score inflation.
Key red flags
New immobility, falls, confusion, incontinence or poor intake requires an acute cause search before it is attributed to frailty progression.
A CFS assigned from current delirious or postoperative function is invalid as a stable baseline and can distort escalation and discharge decisions.
Clinical Frailty Scale use is problematic in younger people, stable lifelong disability or learning disability because dependence may not reflect acquired frailty.
A high frailty score must never be used as a stand-alone DNACPR, critical-care exclusion, surgery refusal or palliative label.
Rapid weight loss, focal weakness, pain, anaemia or inflammatory change suggests specific disease superimposed on vulnerability rather than inevitable decline.
Disagreement between the person, family and records about baseline requires reconciliation rather than choosing the most convenient score.
Usual mobility, cognition, exercise and ADL or IADL help before illness anchor the grade; current ward performance does not.
Abrupt functional or cognitive loss is illness until assessed, even in a person with established severe frailty.
Investigation priorities
Anchor stable function before the stressor.
Management branches
Falls, slow gait, weight loss, recurrent admission or increasing dependency raises frailty concern.
- Treat acute instability and establish whether the observed limitation predates the current illness.
- Use an appropriate screening or scoring tool and verify its output with concrete function and collateral evidence.
- Initiate CGA for confirmed or probable frailty and identify modifiable medical, functional and social drivers.
A baseline CFS is clinically useful in an adult aged at least 65 years.
- Ask what mobility, exercise, cognition, ADL and IADL support were usual about two weeks before acute deterioration.
- Match examples to the scale descriptor using trained clinical judgement and record evidence, rater and uncertainty.
- Keep current dependency separate and reassess after recovery when collateral was weak or baseline was changing.