Educational draft · awaiting clinical reviewThe full textbook explains uncertainty but does not replace live national or local guidance, specialist advice, or current prescribing information.
Capacity and best-interest decisions in frailty
Medicine of older adults · UK scope · Sources checked 27 Aug 2026 · Clinical review pending
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Urgent treatment when capacity is absent
A person without capacity may deteriorate while relatives, documents or courts are unavailable. Necessary emergency care should not be withheld solely because consultation is incomplete.
Action: Treat immediately to preserve life or prevent serious deterioration when this is reasonably believed to be in the person's best interests, using the least restrictive proportionate option. Search for advance refusal and authorised decision makers without harmful delay, document circumstances and rationale and review continued treatment once more information or capacity becomes available.
Purpose and principles
Make lawful, person-centred decisions in frailty by presuming and supporting capacity, testing the specific decision functionally, distinguishing unwise choice from inability and using advance decisions, authorised representatives and transparent least-restrictive best-interests reasoning when capacity is absent.
Frailty increases the frequency and consequence of decisions about admission, surgery, antibiotics, clinically assisted nutrition, residence and treatment ceilings. It does not determine decision-making capacity. Begin by identifying who is making which decision and when. A broad entry such as lacks capacity is clinically and legally inadequate and can wrongly remove choice across unrelated areas.
Under the Mental Capacity Act 2005 in England and Wales, presume capacity and take practicable steps to support it. Present information in accessible language, use hearing aids, glasses, interpreter or communication device, treat pain and fear and choose the person's best time of day. Break complex choices into manageable parts. Do not assess understanding by demanding exact medical terminology.
Indications, selection and cautions
Capacity preserved
The person can explain material consequences in their own terms, compare alternatives and communicate a stable voluntary choice with appropriate support.
Delirium-related incapacity
Fluctuating attention, disorganised thinking and altered arousal impair understanding or weighing and may improve after treatment or at another time.
Decision-specific difference
A person manages a simple immediate treatment choice but cannot integrate the financial, care and risk information required for residence.
Unwise capacitous choice
The person appreciates foreseeable harm and alternatives but prioritises independence, comfort or another value differently from professionals.
Possible coercion
The stated decision changes in another person's presence, reflects threats or cannot be discussed privately despite apparent cognitive understanding.
Urgent incapacity decisionRed flag
Life-threatening infection, bleeding, fracture or airway compromise requires immediate least-restrictive best-interests treatment when the person cannot decide and delay is unsafe.
Red flags requiring action
A capacity conclusion based only on age, frailty, diagnosis or disagreement is invalid.
Uncorrected hearing, language, pain or communication barriers can produce a false finding of incapacity.
Assessment before treatment
01First-line decision definitionFirst stepFirst line
Why
State the exact decision, options, material benefits and harms, timeframe and whether it can safely wait.
Interpretation and limitations
A precise decision prevents an overbroad capacity label and determines what information the person must process.
02Communication and support assessment
Why
Identify language, hearing, vision, literacy, anxiety, pain, timing and assistive needs before testing decision abilities.
Interpretation and limitations
Practicable support is part of valid assessment; failure of an inaccessible interview does not establish incapacity.
03Functional capacity interview
Why
Assess understanding, retention, use or weighing and communication through the person's explanation and reasoning.
Interpretation and limitations
Failure in one function caused by mind or brain impairment supports incapacity for that decision; disagreement alone does not.
04Cause and fluctuation assessment
Why
Evaluate delirium, dementia, depression, psychosis, brain injury, medicines and metabolic or sensory contributors.
Interpretation and limitations
Treatable or fluctuating causes guide delay and reassessment when safe and explain the link to functional inability.
Treatment approach
01Capacity pathwaySupport and test the exact decisionFirst stepThere is a genuine reason to doubt ability to make a material treatment, care or residence choice.+
1Define the decision and material information, presume capacity and optimise communication, timing, sensory aids and reversible distress.
2Assess understanding, retention, use or weighing and communication and identify how any mind or brain impairment causes the functional problem.
3Record evidence and conclusion for that decision and respect the choice when capacity is present, including an unwise choice.
02Fluctuation pathwayRecover capacity before deciding when safeDelirium, acute illness, sedation or fatigue may temporarily impair the decision and delay is possible.+
1Treat the reversible cause, minimise sedatives and choose the person's clearest time and familiar communication support.
Complications, monitoring and follow-up
Repeat capacity when the decision, information, delirium, pain, sedation or communication support changes.
Document which functional element failed and its link to an impairment rather than using a generic incapacity label.
Verify advance decision, attorney and deputy documents against originals or authoritative records and current scope.
Review whether interim restrictive care remains necessary and remove it when capacity or safer alternatives emerge.
Track best-interests decisions against the person's known goals and patient-valued outcomes, not clinical convenience alone.
Revisit serious treatment and residence decisions after rehabilitation and acute cognitive recovery.
Escalate unresolved disagreement early enough for second opinion, mediation, ethics or court review before crisis.
Review the person's current attitude to confinement and the legal authorisation whenever restrictions, understanding, wishes or feelings change.
Special situations
Capacity belongs to a decision
The same person can decide what to eat while lacking ability to weigh a complex tenancy or treatment choice.
Support changes the answer
Hearing aids, pain relief, pictures and a familiar morning conversation can turn an invalid assessment into genuine participation.
Unwise remains possible
Capacity protects the right to prioritise home, independence or comfort differently from clinicians after understanding the consequences.
Family provides evidence
Those close to the person illuminate values and prior wishes but do not automatically acquire a vote or legal authority.
Best interests is personal
The medically longest life is not automatically the correct option when burdens and the person's established values point elsewhere.
Urgency narrows the decision
Emergency authority justifies what cannot safely wait, not every longer-term treatment or placement choice that follows.
Two legal questions remain distinct
Domestic incapacity for a care decision does not automatically settle Article 5 consent to confinement after the 2026 Supreme Court judgment.
Common pitfalls
01
Writing lacks capacity because frail, demented or non-compliant.
02
Testing memory of jargon instead of understanding material personal consequences.
03
Assessing before providing hearing, language and communication support.
04
Using the perceived wisdom of the outcome as the test of capacity.
05
Treating next of kin as an automatic legal decision maker.
06
Assuming an attorney document covers life-sustaining treatment without checking scope.
07
Making a permanent placement decision during reversible delirium when interim care is safe.
08
Conflating DNACPR with refusal of admission, antibiotics or symptom treatment.
09
Allowing emergency best-interests treatment to become indefinite without review.
10
Recording a meeting attendance list without the reasoning and person's wishes.
11
Treating domestic incapacity for residence as automatic absence of Article 5 consent to confinement after [2026] UKSC 16.
Practice
Two practice questions
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Question 1 of 2
0 correct
Medicine of older adultsOriginal SBA
Assessing a risky discharge choice
A frail older adult with mild dementia wants to return home despite a falls risk. He clearly explains the risk, alternatives and why independence matters and proposes accepting daily support. What is the best conclusion?
Sources and review status6 sources · checked 27 Aug 2026 · clinical review pending+
Sources
Sources and review status
National guidance is shown before implementation-dependent detail. Apply principles in context and verify current guidance when a decision affects care. Source check completed 27 Aug 2026; clinical approval remains outstanding.
Supreme Court [2026] UKSC 16Primary judgment separating domestic incapacity from valid Article 5 consent to confinement and emphasising present wishes, feelings and basic understanding.
Editorial contact: Doctor’s Passport editorial team. Source-check date is separate from clinical approval. Report a content problem ·
The functional question is whether the person can understand relevant information, retain it long enough, use or weigh it in reaching the decision and communicate the choice. The inability must result from an impairment or disturbance of mind or brain. The diagnostic and functional elements both matter. A person can have dementia and retain capacity, or have delirium and temporarily lose it.
Using and weighing is often the most difficult element. Ask the person to explain how benefits, burdens and alternatives apply to their life. Explore apparently fixed or contradictory reasoning without requiring agreement with clinicians. Executive function and frontal disease may impair the ability to use foreseeable consequences despite fluent conversation; corroborate with real-world behaviour while avoiding an outcome-based judgement.
Capacity may fluctuate. If a decision can safely wait, treat delirium, infection, medicine toxicity or metabolic disturbance and reassess at the person's optimal time. If delay would risk serious harm, make the necessary decision under the emergency legal framework and revisit ongoing treatment when capacity returns. Record what could and could not wait.
A capacitous adult may refuse recommended treatment, discharge to a risky environment or choose a lower chance of recovery. Confirm the decision is informed and voluntary, document the discussion and offer mitigation. Family distress does not authorise override. Concern about coercion or undue influence requires separate safeguarding and legal assessment because a choice can be cognitively competent yet not freely made.
When capacity is absent, identify prior authority. A valid and applicable advance decision to refuse treatment must be followed in England and Wales; refusal of life-sustaining treatment has additional formal requirements. A registered health-and-welfare lasting power of attorney or court-appointed deputy can decide only within granted scope. An advance statement informs values but is not itself a binding refusal.
Best interests is a structured decision, not whatever clinicians think medically sensible. Avoid discrimination and consider whether capacity may return, the person's past and current wishes, beliefs and values, all available options and the views of those close to the person. Choose the less restrictive alternative when it can achieve the purpose. Document disagreements and reasons rather than merely listing attendees.
For confinement engaging Article 5, [2026] UKSC 16 separates the domestic capacity question from valid consent to confinement. A finding that someone cannot make the full residence or care decision no longer automatically means that they cannot consent for Article 5 purposes. Establish the person's current wishes and feelings and whether they have the basic understanding relevant to the restrictions. Continue best-interests and safeguarding work. If consent to confinement is negative or genuinely ambiguous, use the applicable authorisation or current legal route and seek specialist advice while operational guidance develops.
Consultation has boundaries. Relatives and carers provide vital evidence about the person but do not automatically decide. Exclude or manage a participant whose interests conflict or who poses risk. In England and Wales, instruct an IMCA for qualifying serious treatment or accommodation decisions when no appropriate unpaid person can be consulted. Seek clinical ethics, second opinion or legal advice for unresolved serious disagreement.
End-of-life decisions need the same rigour. DNACPR concerns CPR, not all treatment, and clinicians should involve a capacitous person or, where capacity is absent, those close to them unless consultation would cause harm or is impracticable. A best-interests decision to withhold or withdraw life-sustaining treatment is based on benefit and burden, never an intention to cause death or a judgement that frail life has less value.
Key points
Age, frailty, diagnosis, care-home residence and an unwise decision never establish incapacity; start with a presumption that the adult can decide.
First-line capacity assessment defines the exact decision and material information, provides communication support and checks understanding, retention, use or weighing and communication.
Capacity is time and decision specific. A person may decide about antibiotics but not a complex residence plan, and delirium may justify delay until capacity improves when safe.
Document the causal impairment or disturbance of mind or brain and how it produces inability under the applicable legal test; poor memory alone is insufficient.
If capacity is present, respect the informed choice even when professionals or relatives disagree, while offering harm reduction and review.
If capacity is absent, check valid advance decisions, registered health-and-welfare attorney or court-appointed authority before convening a best-interests process.
Best interests considers clinical benefit and burden, past and present wishes, values, beliefs, relationships, less restrictive options and the views of appropriate people; family do not vote on the outcome.
Following [2026] UKSC 16, lack of domestic decision-making capacity about residence or care does not by itself prove inability to consent for Article 5 purposes; examine current wishes, feelings and basic understanding of the confinement separately.
Delirium with a decision that can safely wait should prompt treatment and timed reassessment.
A claimed attorney must have valid registered authority covering the present health decision before acting.
A written life-sustaining-treatment refusal requires careful validity and applicability review under the governing law.
A family member with financial or safeguarding conflict may not be an appropriate source of substitute decision evidence.
Serious unresolved dispute about life-sustaining treatment or residence needs senior legal and ethics escalation.
05
Advance authority search
Why
Check advance decisions, advance statements, attorney or deputy documents, records and current scope and applicability.
Interpretation and limitations
A binding refusal or authorised decision takes priority within its terms; informal next of kin status does not confer authority.
06Best-interests evidence review
Why
Gather wishes, values, beliefs, clinical outcomes, burdens, less restrictive options and views of appropriate people.
Interpretation and limitations
The decision should represent the person as far as possible and explain why the selected option outweighs alternatives for them.
07Article 5 consent and restriction review
Why
Assess current wishes, feelings and basic understanding of confinement separately from domestic capacity for the wider care decision.
Interpretation and limitations
Domestic incapacity alone is insufficient; negative or ambiguous consent requires the applicable authorisation or current legal route and specialist advice.
2
Make only necessary interim decisions through the least restrictive lawful process and preserve options for later choice.
3Reassess the same decision at a defined time and update treatment, residence and documentation when capacity returns or remains absent.
03Best-interests pathwayConstruct the decision around the person's valuesThe person lacks capacity and no applicable advance refusal or authorised direction resolves the choice.+
1Identify clinical options and prognosis, past and current wishes, values, beliefs, relationships and the possibility of future capacity.
2Consult appropriate people and an IMCA where required, compare burdens and less restrictive alternatives and manage conflicts of interest.
3Where arrangements amount to confinement, assess Article 5 consent separately and obtain the applicable authorisation or current legal route if consent is negative or ambiguous.
4Record the reasoning, responsible decision maker, dissent and review conditions and seek ethics or legal help for serious unresolved dispute.
04Emergency and end-of-life pathwayAct proportionately without erasing future reviewUrgent treatment or a life-sustaining intervention decision cannot await a full planned meeting.+
1Check immediately available records and authority and provide necessary least-restrictive treatment when delay risks serious harm.
2Clarify that DNACPR, admission, antibiotics and other treatments are separate decisions and avoid disability or frailty-based assumptions.
3Reassess with the person if capacity returns or complete consultation promptly, revising ongoing treatment and documenting any withheld or withdrawn intervention.
In England and Wales, an IMCA may be required for serious medical treatment or accommodation decisions when the person lacks capacity and has no appropriate unpaid representative.
Emergency treatment necessary to preserve life or prevent serious deterioration can proceed in best interests when delay is unsafe, using the least restrictive option and documenting the rationale.
Scotland and Northern Ireland use different statutory frameworks and terminology; apply the law where care occurs rather than treating the Mental Capacity Act 2005 as UK-wide.