The short version
- A living will states which treatments you would want or refuse in defined circumstances. It names nobody, so it can only be applied by someone else reading it.
- A healthcare proxy — also called a healthcare agent, surrogate, representative or medical power of attorney — names a person to decide for you, including in situations your living will never anticipated.
- Most people need both. The instructions tell your agent what you value; the agent handles the case the instructions do not cover.
- A DNR or POLST is not an advance directive. It is a medical order signed by a clinician, and it is the only one of these that ambulance crews can act on.
Three documents, three jobs
Start with what each one actually does, because the terminology varies by state and the same document goes by several names.
| Document | What it contains | What it cannot do |
|---|---|---|
| Living will | Your instructions about treatments — resuscitation, ventilation, artificial nutrition and hydration, dialysis — in stated conditions | Appoint anyone. It has to be read and interpreted by someone else |
| Healthcare proxy | The appointment of a person to make medical decisions once you cannot make or communicate them | Tell that person what you would have wanted, unless you have also written it down |
| POLST or DNR | A medical order, signed by a clinician, translating goals into instructions for treatment now | Name a surrogate, or cover anything beyond the specific orders on the form |
The names shift across state lines. A healthcare proxy in one state is a healthcare agent, a healthcare surrogate, a healthcare representative or a durable power of attorney for health care in another. The function is the same in each; the form and its execution requirements are not.
What a living will can and cannot say
A living will tells clinicians how you want to be treated if you cannot decide for yourself. Typically it lets you say which common interventions you would want and which you would refuse, and under which conditions each choice applies — most often terminal illness, permanent unconsciousness, or an end-stage condition.
Its limitation is structural rather than a drafting failure. A living will can only address situations somebody imagined in advance, and real deterioration is messier than that.
The question the clinician is actually facing
Is this one of the situations the document imagined?
Yes — a named condition
Terminal illness, permanent unconsciousness, an end-stage condition. The living will answers directly, and it answers in your own words.
No — and it usually is not
A stroke with an uncertain prognosis, a treatable infection in advanced dementia, a ventilator that might be needed for four days or four months. Only a person can decide this.
That is the argument for writing the reasoning, not only the choices. A short paragraph explaining what a good outcome would mean to you — what you would want to be able to do, what you would find intolerable — is more use to a doctor and a family at 3am than a longer list of ticked boxes.
Why the agent matters more than the form
The healthcare proxy is the more powerful document precisely because a person can do what a form cannot: ask questions, absorb a prognosis, weigh a new option nobody had thought of, and change position as the facts change.
Choosing well is therefore less about closeness than about composure. The role involves sitting in a room with clinicians, understanding what is being said, deciding, and then holding that decision against relatives who disagree. The criteria that actually predict a good agent:
- They know what you value, because you have had the conversation — not because they can guess.
- They can hear a prognosis without collapsing. Devotion and steadiness are different traits.
- They can say no to family. The pressure in these rooms comes from relatives more often than from doctors.
- They are reachable and can get there. Distance matters less than availability, but both matter.
- They are willing. Ask first. Being appointed without knowing is how an agent freezes.
Name at least one alternate. And if you are also putting a financial power of attorney in place, be aware that health and money are usually separate documents with separate formalities — appointing the same person for both is common, but it does not happen automatically.
"Advance directive" is the umbrella, not a third document
Much of the confusion here is vocabulary. In most usage, advance directive is the category term covering both instruments: your written instructions and your appointment of an agent. Many states publish a single combined form that does both jobs, which is why people sometimes think an advance directive is a distinct third document. It is not — it is the envelope.
The practical consequence is that "I have an advance directive" tells you almost nothing. Ask which parts of it were completed. A common and expensive outcome is a signed statutory form on which the treatment preferences were filled in carefully and the agent section left blank, or the reverse.
DNR and POLST are medical orders, and that is the whole difference
This is the distinction clinicians care about most and the public knows least. An advance directive is a legal document expressing wishes. A DNR or a POLST is a medical order, written and signed by a clinician, that directs treatment right now.
That difference has an immediate operational consequence: ambulance crews cannot act on an advance directive. It is not an order, and emergency medical services follow orders. A POLST — the acronym varies by state, appearing as POLST, MOLST, POST or COLST — is designed for people with serious illness and turns treatment goals into signed orders that travel with the patient and are honoured across settings, including out of hospital and during transport. A DNR is narrower still: it addresses CPR only, and applies only if the heart or breathing stops.
How directly each document binds a clinician
Living will
Healthcare proxy
POLST or DNR
The three are meant to work together, not to replace each other. The directive is the durable statement of what you want and who speaks for you. The portable order is what converts that into something an emergency crew can follow, and it is generally appropriate only once someone is seriously ill.
So do you need both?
The exception is worth naming honestly. If you have nobody you would trust with the decision, a detailed living will carries more of the weight, and it is worth being more specific than you otherwise would.
Living will template
Read the full structure free — the conditions that trigger it, the treatment categories, and the statement of values that makes the rest usable. Then check your own state's form and witnessing rules before signing.
The failure is almost never the drafting
Advance directives fail in a very specific way: correctly signed, and not available. Hospital record systems are frequently unable to share a directive between institutions or even between departments of the same hospital — the emergency department may be running a different system from the one holding your scanned document. If the directive cannot be found in minutes, it does not influence the decision that is being made in minutes.
The consequences of that are not evenly distributed. The default in the absence of a document is to treat, so a missing directive tends to produce more intervention rather than less. The whole point of writing one is to be heard when you cannot speak, and a document nobody can retrieve does not speak.
Where the paperwork has to live
Distribution, which is the part people skip
- Give a copy to your healthcare agent and to every alternate you named.
- Give a copy to your primary care physician and ask for it to be added to your chart.
- Give a copy to any specialist or facility treating you for a serious condition.
- Give a copy to the family members who might turn up at the hospital — including the ones who may disagree.
- Keep the original somewhere findable at home and tell people where. Not a safe-deposit box.
- Take a copy with you to any planned hospital admission, and re-check that it is on file.
- Consider a registry. Some states run one; national services also store directives for retrieval by clinicians.
- Carry a card or phone note saying the directive exists, who your agent is, and how to reach them.
Alongside the directive itself, a separate medical authorization permitting your health information to be released to named people is worth having. Decision-making authority and access to information are legally distinct, and a relative who cannot get an answer from the ward is a common, avoidable friction.
What actually changes over time
These are not documents to sign once. Review them at least annually and after any significant change — a new diagnosis, retirement, a move to another state, the death or illness of the person you appointed. A directive naming an agent who died four years ago is a document with a gap in the middle of it.
The most useful thing you will do here is not a signature. It is the conversation with the person you appoint, held while nothing is wrong, in which you say what a good outcome and an unacceptable one look like to you. The forms exist to give that conversation legal effect. They are not a substitute for having it, and an agent who has had it will handle the situation the form failed to anticipate — which is the situation that arrives.
Sources
- National Institute on Aging — advance care planning: advance directives for health care
- Mayo Clinic — living wills and advance directives for medical decisions
- CaringInfo — portable medical orders (POLSTs) versus advance directives
- CaringInfo — storing and retrieving your advance directive
- New York Courts law librarian — living will and healthcare proxy compared
- Why electronic health records often fail to surface an advance directive
General information, not legal advice. This guide explains how these documents and rules generally work. Law varies by jurisdiction and changes, and none of it is applied to your circumstances here. For anything consequential, consult a licensed attorney where you are.
Frequently asked
What is the difference between a living will and a healthcare proxy?
A living will records your instructions about medical treatment if you cannot speak for yourself — which interventions you would want or refuse, and in what circumstances. A healthcare proxy appoints a person to make those decisions instead. The living will names nobody; the proxy document contains no instructions. They answer different questions, which is why most people complete both.
Do I need both a living will and a healthcare proxy?
For most people yes. The proxy is the more powerful of the two because a person can respond to a situation nobody anticipated, and real medical decisions rarely match the wording of a form. The living will supports them: it gives your agent something concrete to point to when relatives disagree, and reassures clinicians the agent is reflecting your wishes rather than their own.
Is a DNR the same as an advance directive?
No. A DNR is a medical order signed by a clinician that instructs staff not to attempt CPR if your heart or breathing stops. An advance directive is a legal document you complete yourself, expressing wishes and appointing an agent. Because an advance directive is not a medical order, emergency crews generally cannot act on it — which is what portable medical orders such as POLST exist to solve.
What is a POLST and who needs one?
A POLST — also called MOLST, POST or COLST depending on the state — is a portable medical order signed by a clinician that turns treatment goals into instructions honoured across care settings, including by ambulance crews. It is intended for people already living with serious illness or frailty, not for healthy adults, and it does not name a surrogate. It complements an advance directive rather than replacing it.
Does a living will need to be notarised?
It depends on the state. Some require two witnesses, some require notarisation, and some accept either. States also commonly disqualify certain people from witnessing — often your appointed agent, your relatives, anyone who would inherit from you, and staff at the facility treating you. Use your own state's prescribed form where one exists and follow its execution instructions exactly.