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Informed Consent and Capacity Assessment
TEXTPreop Eval · 8 min read
Five legal elements, four functional capacities, one default surrogate hierarchy. Get this right or the rest doesn't matter.
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4 min read8 sections- List the five legal elements of valid consent.
- Distinguish capacity from competency.
- Identify surrogate decision-makers.
- Manage emergency + minor consent.
Five elements of valid consent
All five required for legally valid consent.
Missing any element makes the consent inadequate.
Anesthesia consent is typically separate from surgical consent — patients are autonomous in declining anesthesia even if accepting surgery (rare in practice but legally protected). 'Material risk' is determined by the reasonable-patient standard in most modern jurisdictions: risks a reasonable patient would want to know, not risks a reasonable physician would disclose.

Capacity vs competency
Capacity is a clinical decision-making assessment performed at the bedside by any qualified provider.
Capacity is DECISION-SPECIFIC (can consent to one thing but not another — capacity to consent to appendectomy is a different threshold than capacity to refuse life-sustaining treatment) AND TIME-SPECIFIC (can fluctuate hour-to-hour with delirium, sedation, pain, hypoxia).
Capacity is NOT the same as agreeing with the provider.
A patient with full capacity has the absolute right to refuse recommended care, even unwise care.

Appelbaum-Grisso four functional abilities
All four required.
Use a structured assessment in unclear cases; document specifically which ability is intact vs absent.

When capacity is in question
- delirium (most common, often reversible)
- dementia (depends on stage + decision)
- depression (severe)
- psychosis
- intoxication
- hypoxia
- electrolyte derangement
- recent sedatives
- optimize reversible factors first — treat pain
- correct electrolytes
- manage delirium
Re-assess after optimization.
If still impaired, identify surrogate.
Document the cognitive findings, the structured capacity assessment, and the rationale for surrogate decision-making.
Psychiatry consult for borderline or contested cases.

Surrogate decision-maker hierarchy
Default order (state-specific; consult local statute): healthcare proxy / durable power of attorney for healthcare if designated spouse adult children (majority) parents adult siblings extended family court-appointed guardian.
Verify against your state's surrogate-consent law.
Some states have specific provisions for domestic partners, friends with longstanding relationship, or close-friend statutes.
Document the surrogate-finding process — whom you contacted, in what order, who agreed to serve.

Emergency consent + minors
Document the emergency rationale.
Once stabilized, obtain consent for ongoing care from patient or surrogate.
Pregnancy, contraception, STI care, mental health: minor confidentiality provisions vary widely by state.
Refusal of care for a minor against medical advice may trigger child-protective involvement when the refusal poses serious risk.

Language + literacy + interpreter requirements
Patients with limited English proficiency require a qualified medical interpreter — NOT family members, NOT Google Translate, NOT bilingual staff without certification (Title VI of the Civil Rights Act, hospital accreditation standards).
Document interpreter's name + ID in the consent note.
Health literacy: 1/3 of US adults have low health literacy.
- plain language ('cut you open' not 'incise')
- teach-back ('can you tell me in your own words what we discussed')
- written summaries in preferred language
- drawings + diagrams
- family member present for understanding (not for consent itself)

DNR status in the OR — required reconsideration
Discuss DNR with patient or surrogate before surgery — the procedure changes the calculus (intubation + cardioversion may be necessary parts of the planned anesthetic).
Three options to document: (1) full DNR maintained as-is, (2) full suspension during anesthesia + PACU recovery period, (3) procedure-directed — patient specifies which interventions are acceptable (e.g., intubate but no chest compressions; cardiovert v-fib but no ECMO).
Document the agreed plan + duration of any suspension + when full DNR resumes. 'Automatic suspension of DNR for surgery' is obsolete and ethically problematic — it ignores patient autonomy.

⚠ Common pitfalls
- Treating capacity as binary — it's decision-specific + time-specific.
- Using family as interpreter — Title VI requires qualified medical interpreter.
- Skipping documentation of the consent conversation — paper trail matters legally.
- Listing every possible risk — focus on material risks for this patient + this procedure.
💎 Clinical pearls
- Five elements: capacity, voluntariness, disclosure, comprehension, documentation.
- Appelbaum-Grisso four abilities: understanding, appreciation, reasoning, expressing a choice.
- Capacity assessment: optimize reversible factors (pain, sedation, electrolytes) before declaring incompetent.
- Emergency consent (presumed) when delay = death/serious harm; document the rationale.
Recap
- Five elements: capacity, voluntariness, disclosure, comprehension, documentation.
- Appelbaum-Grisso four abilities: understanding, appreciation, reasoning, expressing a choice.
- Capacity assessment: optimize reversible factors (pain, sedation, electrolytes) before declaring incompetent.
- Emergency consent (presumed) when delay = death/serious harm; document the rationale.
Mark each section done to complete the module.