The four pillars, weighed properly

What the examiner is really testing

The four pillars come from Beauchamp and Childress's Principles of Biomedical Ethics, first published in 1979. They are not law and not a ranking. Each is a prima facie duty: it binds you unless another duty outweighs it in this particular case.

Examiners hear the list all day. Marks go to the weighing: finding the two pillars that collide, deciding which gives way and saying why. Four definitions recited in a row describe the problem. They don't solve it.

The four pillars in one line each

• Autonomy: an adult with capacity decides what is done to their own body. Example: a patient turns down the operation the team recommends.
• Beneficence: act for the patient's good, as they define it with you. Example: recommending a statin and honestly explaining why.
• Non-maleficence: don't cause harm the benefit can't justify. Example: chemotherapy is toxic, yet worth it when it offers a real chance of cure.
• Justice: be fair between patients, including those not in the room. Example: one very expensive drug leaves less money for everyone else's care.

Where autonomy wins, and where it stops

Autonomy is strongest as a right to refuse. Under the Mental Capacity Act 2005, an unwise decision is not proof that someone lacks capacity. In Re T the Court of Appeal said this right holds whether the patient's reasons are "rational, irrational, unknown or even non-existent".

• Demands: refusing is not demanding. In Burke (2005) the Court of Appeal held that autonomy does not entitle a patient to insist on a particular treatment.
• Harm to others: autonomy covers your own body. It does not stretch to putting other people at serious risk, like an unsafe driver.
• Shared money: once a request costs something that other patients need, you have moved from autonomy into justice.
• Capacity: the right binds only if the person can understand, retain, weigh and communicate the decision. That is a test, not an impression.

How to weigh two pillars that clash

First turn each pillar into a sentence about this patient. "Respect her autonomy" becomes "don't transfuse a woman with capacity who has refused blood". Then weigh. A handful of facts usually decides which way it goes.

• Capacity: can this person make this decision, now?
• Reversibility: can a wrong call be undone, or is it final?
• Urgency: what does waiting an hour, or a day, actually cost?
• Other people: is anyone outside the room exposed to serious risk?
• A third way: a time-limited trial, a second opinion or a short delay may satisfy both pillars.

Worked example: a refusal of blood

A 26-year-old with a bleeding stomach ulcer is alert and understands she may die without a transfusion. She refuses blood on religious grounds but accepts everything else. Her parents ask you to transfuse her once she is unconscious.

• Autonomy: she has capacity, so her refusal binds. Giving blood anyway would be treating her without consent.
• Beneficence redirects rather than disappears: ask exactly what she will accept, then push every other option, such as urgent endoscopy to stop the bleed.
• Non-maleficence cuts both ways. Dying from a treatable bleed is a harm, and so is forcing blood on someone who said no.
• Justice asks a quiet question: would you respect this refusal from someone whose beliefs you found easier to accept? If yes, respect it here.
• Line: record her refusal now, in writing, signed and witnessed, stating it applies even if her life is at risk. Her parents are heard, but they don't decide.
• What would change my mind: real doubt about her capacity, or signs that someone is pressuring her.

How this comes up on the day

• "What are the four pillars of medical ethics?" — one line and one example each, then say they clash and the skill is weighing them.
• "Is any pillar more important than the others?" — no fixed ranking, but explain why autonomy usually wins refusals and loses demands.
• "A patient with capacity refuses life-saving treatment. What do you do?" — check capacity properly, respect the refusal, then redirect beneficence into every other option.
• "A patient demands a drug the NHS won't fund. Is saying no unethical?" — separate refusing from demanding, then name who else loses if it is funded.
• "When is it right to override a patient's wishes?" — only when they lack capacity or others face serious harm, never just because you disagree.

The words to use

Prima facie duty

A duty that binds you unless another duty outweighs it in the case in front of you. All four pillars are prima facie, so none wins automatically.

Capacity

The ability to make a particular decision at a particular time: to understand, retain, use or weigh the information, and communicate a choice (Mental Capacity Act 2005).

Paternalism

Overriding someone's choice for their own good. Recommending a treatment is beneficence; forcing it on an adult with capacity who has refused is paternalism, and unlawful.

Opportunity cost

What else the money could have bought. In a fixed NHS budget, funding one treatment means care that other patients, not in the room, will not get.

Model answer