Advance Directives and Living Wills, Explained

What is an advance directive?

An advance directive is any legal document that records your health-care wishes for a time when you cannot express them yourself. In American usage it is an umbrella covering two main instruments: the living will, which states what treatment you would or would not want, and the health care proxy — a durable power of attorney for health care — which names the person authorized to decide for you.

Three properties define the category. Advance directives speak only when you cannot: while you can communicate, clinicians ask you, not the paperwork. They are revocable — you can change or cancel them at any point while you have capacity. And they are creatures of state law: each state sets its own forms, witnessing and notarization rules, and terminology, which is why a directive deserves a review after any move across state lines.

What does a living will actually cover?

A living will typically addresses the heavy interventions of critical and end-of-life care: cardiopulmonary resuscitation, mechanical ventilation, artificial nutrition and hydration through tubes, dialysis, and whether the goal in a given situation should be prolonging life or prioritizing comfort. Most forms frame these choices around scenarios — a terminal condition, permanent unconsciousness — rather than asking you to predict a specific illness.

Two honest limits are worth knowing. First, no document anticipates every situation; real medical crises rarely match the scenario on the form, which is why the person you name matters more than the boxes you check. Second, a living will is a statement of wishes, not a medical order — in an emergency, responders act on orders, which is what makes the POLST described below a different kind of instrument.

The most useful living wills add a few plain-language sentences about what matters: what you consider a good day, what you would trade for more time, and what you would not.

Who speaks for you: choosing a health care proxy

The proxy decision is the consequential one. This person — called an agent, surrogate, or health care power of attorney depending on the state — will apply your values to situations no form predicted. The best agent is not necessarily the closest relative: it is someone who knows your wishes, can say them out loud in a tense room, and will not substitute their own preferences under pressure.

The decisions an agent actually faces are often about settings as much as treatments. Long before any question about machines, families weigh independent vs assisted living; as dementia advances, memory care vs assisted living; when needs turn medical, assisted living vs nursing home; and near the end, the difference between hospice and assisted living — a service versus a place. An agent who has heard you talk about where and how you want to live is equipped for all of it in a way no checkbox provides.

Naming a backup agent, telling both that they were chosen, and telling the rest of the family closes the loop — surprises at the bedside are where conflict starts.

How is a POLST different?

POLST and MOLST forms — the acronym varies by state — are portable medical orders, signed by a clinician, that translate a seriously ill person's preferences into instructions emergency responders and facilities act on directly. Unlike a living will, which any adult can complete for a hypothetical future, a POLST is written for people already living with serious illness or frailty, and it travels across settings — home, ambulance, hospital, nursing facility.

The evidence suggests the mechanism works: a systematic review comparing POLST documentation with the care actually delivered found end-of-life care largely concordant with the orders 1Ref 1Peer-reviewed systematic review (see article) (2021).Are We Getting What We Really Want? A Systematic Review of Concordance Between POLST Documentation and Subsequent Care Delivered at End-of-Life.That end-of-life care is largely concordant with POLST orders — the evidence for POLST as a mechanism that translates treatment preferences into portable medical orders that get followed.. That is the practical argument for completing one when illness is advanced — wishes recorded as orders are wishes that tend to be followed.

A POLST complements rather than replaces an advance directive: the directive names your agent and records your values; the POLST turns today's specific decisions into tonight's instructions.

Why plan before a crisis?

Because the crisis rarely announces itself, and decline does not follow a schedule. A prospective study that tracked older adults through their last year of life found five distinct trajectories of disability — from no disability at all to catastrophic, accelerated, progressive, and persistently severe decline 2Ref 2Gill TM, Gahbauer EA, Han L, Allore HG (2010).Trajectories of Disability in the Last Year of Life.The five distinct disability trajectories observed in the last year of life — evidence that functional decline near death is variable and unpredictable, the argument for planning before a crisis.. Some people lose decision-making capacity years before death; others lose it in an afternoon. Documents completed while you are well cover both.

This is why clinicians treat the documents as one artifact of a larger practice — advance care planning, the ongoing conversation about what matters as health changes. The paperwork is the receipt; the planning is the conversation. It is also why the diagnosis of a progressive illness, dementia especially, moves this from someday to soon: documents require capacity to sign, and capacity narrows as such diseases advance.

How do you have the conversation?

Structure helps more than scripts. AHRQ's SHARE Approach, a five-step model for shared decision making, gives the shape: seek the patient's participation, help compare options, assess values and preferences, reach a decision together, and evaluate it over time 3Ref 3Agency for Healthcare Research and Quality (2020).The SHARE Approach.The five named steps of AHRQ's SHARE Approach to shared decision making: seek participation, help compare options, assess values and preferences, reach a decision together, and evaluate the decision.. Applied around a kitchen table, that means asking what a good day looks like, what would feel worse than dying, who should decide — and returning to the answers as health changes.

Plain-language workbooks such as Five Wishes exist for families who want the questions laid out on paper, setting the medical choices alongside the human ones — comfort, forgiveness, how you want to be remembered. Whether a particular form satisfies your state's signing rules is a separate, checkable question; the conversation it prompts is portable everywhere.

Clinicians can be enlisted too: an appointment made specifically to talk through choices tends to go deeper than five minutes borrowed from a visit about something else.

Making the documents work: copies, updates, and where to get help

A directive no one can find at 2am might as well not exist. The working setup is simple: the agent has a copy, the clinician's office has one in the chart, the hospital gets one at admission, and the original lives somewhere named out loud — not a safe-deposit box the bank will open on Monday. Photographs on the agent's phone are a reasonable backstop.

The documents are worth revisiting at life's hinge points: a serious new diagnosis, a hospitalization, a move to another state, a divorce, or the death or decline of the named agent.

For help getting started, Aging and Disability Resource Centers offer a single, coordinated entry point for objective information and counseling on long-term services and supports 4Ref 4Administration for Community Living, U.S. Department of Health and Human Services (2024).Aging and Disability Resource Centers.That Aging and Disability Resource Centers provide a single, coordinated entry point offering objective information, counseling, and assistance on long-term services and supports., and an Area Agency on Aging — the body each state designates to plan and coordinate services for older adults in its area — can point to local advance-care-planning help and much else besides 5Ref 5Administration for Community Living, U.S. Department of Health and Human Services (2024).Area Agencies on Aging.The definition and role of an Area Agency on Aging as the public or nonprofit agency each state designates to plan and coordinate services for older adults within its area..