Medical Ethics: Autonomy, Capacity, Consent & Confidentiality
A boards-focused review of the ethical-legal framework for patient decision-making: the primacy of autonomy, how to assess decision-making capacity (and how it differs from legal competence), the elements and exceptions of informed consent, the advance-directive/surrogate hierarchy, and exactly when confidentiality must be broken.
Autonomy is the master principle
Modern medical ethics rests on four pillars — autonomy, beneficence, nonmaleficence, and justice — but on the boards, autonomy dominates. Respect for autonomy is the ethical foundation of both informed consent and confidentiality: an adult with decision-making capacity has the right to accept or refuse any intervention, even one that is life-saving, and even when the physician strongly disagrees. The recurring test theme is that the patient's informed, voluntary choice wins. Your job in a vignette is usually not to override the patient but to confirm the decision is informed and made with capacity — so the most common correct "next step" is to assess decision-making capacity or clarify the patient's understanding, not to talk the patient out of the choice.
- Four principles: autonomy, beneficence, nonmaleficence, justice — autonomy is the most tested.
- An adult with capacity can refuse any treatment, including life-saving therapy (classic: Jehovah's Witness refusing blood) — even if refusal leads to death.
- Capacity ≠ competence. Capacity is a clinical judgment made by a physician, is decision-specific, and can fluctuate; competence is a legal determination made by a court and is global.
- Valid informed consent = decision-making capacity + disclosure (diagnosis, nature/purpose of procedure, risks, benefits, alternatives including no treatment) + understanding + voluntariness (no coercion).
- Consent can be withdrawn at any time.
- A signed consent form is documentation, not a substitute for the consent conversation.
- An unusual or "wrong" choice does not, by itself, prove lack of capacity.
- When refusal seems dangerous or the patient seems impaired, the safe move is to assess capacity — not to immediately override or proceed.
- You may proceed without informed consent only via a recognized exception: emergency (implied consent), lack of capacity (surrogate), waiver, therapeutic privilege, or a minor without a statutory carve-out.
Capacity vs. Competence
| Feature | Decision-Making Capacity | Competence |
|---|---|---|
| Determined by | Physician (clinical judgment) | Court / judge (legal) |
| Scope | Decision-specific (this choice, now) | Global legal status |
| Stability | Can fluctuate (e.g., delirium, intoxication) | Stable legal designation |
| Typical question | "Can this patient consent to this surgery today?" | "Is this person legally able to manage their affairs?" |
- Communicate a choice — and the choice is reasonably stable over time.
- Understand the relevant information (diagnosis, risks, benefits, alternatives).
- Appreciate the situation and its consequences as they apply to oneself (impaired by psychosis/delusion or severe delirium).
- Reason — manipulate the information rationally and consistently with the patient's own values and goals.
If the patient lacks capacity, decisions follow the patient's own prior wishes first — a valid advance directive, which may be an appointed health-care proxy (durable power of attorney for health care — distinct from a financial POA) and/or a living will. A proxy speaks for the patient across situations and is often given precedence because they can adapt to the actual clinical scenario, but must honor the explicit instructions of a living will where they apply. If there is no advance directive, use the surrogate/next-of-kin hierarchy (varies by state): spouse → adult children → parents → adult siblings. Surrogates use substituted judgment (what the patient would have wanted); if wishes are truly unknown, the best-interest standard.
Classic vignette patterns and the expected move:
- Jehovah's Witness (adult, alert, understands consequences) refuses transfusion → respect the refusal; do not transfuse.
- Patient with delirium, acute psychosis, or intoxication refusing care → assess capacity first; if lacking, seek a surrogate (or treat under emergency doctrine if unstable).
- "Patient signs consent, then changes his mind on the way to the OR" → consent may be withdrawn; do not proceed.
- Unconscious trauma patient, no surrogate reachable, delay is dangerous → implied (emergency) consent — treat.
- Elderly patient who disagrees with the doctor but clearly understands the risks → has capacity; honor the choice.
Buzz phrase for the answer stem: "assess/determine the patient's decision-making capacity" is frequently correct before either proceeding or overriding.
Exceptions to informed consent
| Exception | Explanation |
|---|---|
| Emergency | Patient incapacitated, no surrogate available, and delay risks serious harm → implied consent |
| Waiver | Patient voluntarily waives the right to be informed |
| Lack of capacity | A surrogate decision-maker provides consent |
| Therapeutic privilege | Rare/controversial; withhold information only if disclosure would itself severely harm the patient |
| Minor | Parental/guardian consent required unless emancipated or a statutory exception applies |
A genuine clinical/medicolegal framework for what an informed-consent conversation must cover — PARQ (often charted as "PARQ discussed"):
- P — Procedure (its nature and purpose)
- A — Alternatives (including the option of no treatment)
- R — Risks (and expected benefits)
- Q — Questions answered
If any of the P-A-R elements were never discussed, the consent is not truly informed, regardless of the signature on the form.
Confidentiality — the default, not an absolute
Confidentiality is an extension of autonomy: the physician is obligated to protect patient information, and it is the default expectation of the therapeutic relationship. It is not absolute, however. A small set of situations require or permit breaching confidentiality — almost always to prevent serious harm to the patient, an identifiable third party, or the public. On exam, the correct answer breaks confidentiality only when there is a concrete, foreseeable danger; vague or hypothetical concerns do not justify disclosure, and you should disclose the minimum necessary information.
- Reportable communicable diseases (TB, syphilis, gonorrhea/chlamydia, HIV, measles, hepatitis, etc.) → notify public health.
- Tarasoff duty to warn/protect — a credible threat of serious harm to an identifiable third party → discharge by warning the victim, notifying police, and/or hospitalizing the patient.
- Suspected child or elder abuse → mandatory report (based on reasonable suspicion, not proof).
- Patient is a danger to self (suicidal) or others (homicidal) → may hospitalize/intervene.
- Gunshot and stab wounds → report to police/law enforcement.
- Impaired drivers (e.g., poorly controlled seizures, some dementias) → report per state law (some states mandate, some permit).
Key nuance: reporting a communicable disease or notifying an at-risk HIV partner runs through public-health partner-notification channels — first counsel the patient to disclose; the physician generally does not personally confront third parties outside a Tarasoff-type imminent, identifiable threat.
Minors — when can they consent themselves?
| Situation | Who consents |
|---|---|
| Emancipated minor — married, active military, financially self-supporting/living independently, has own child, or court-declared | The minor, as an adult, for all care |
| STIs, contraception, prenatal/pregnancy care, substance-abuse & (often) mental-health treatment | The minor may consent without parental involvement (varies by state) |
| Emergency care | Treat under implied consent — do not delay to reach a parent |
| Routine, non-exception care | Parent/legal guardian |
Practice Medical Ethics now
Board-style questions, spaced-repetition flashcards, and a Socratic AI tutor — free to start.