An advance healthcare directive is a set of legal documents that spell out your medical treatment preferences for situations where you can’t speak for yourself. It typically includes two parts: a living will, which states what treatments you do and don’t want, and a durable power of attorney for healthcare, which names someone to make decisions on your behalf. Only about 25% of U.S. adults have one, despite the fact that any adult can create one regardless of age or health status.
The Two Core Documents
An advance directive isn’t a single form. It’s an umbrella term covering two distinct legal tools that work together.
A living will is a written document that tells your medical team exactly how you want to be treated during a medical emergency or end-of-life situation. It covers which treatments you’d accept, which you’d refuse, and under what specific conditions those choices apply. Common decisions addressed include whether you want to be placed on a breathing machine, whether you’d want tube feeding or IV nutrition, whether you want dialysis, and your preferences around pain management and organ donation.
A durable power of attorney for healthcare (sometimes called a healthcare proxy) names a specific person to make medical decisions for you when you’re unable to communicate them yourself. This person isn’t limited to the scenarios you’ve written down. They can respond to unexpected situations, ask your doctors questions, review your medical records, and consent to or refuse treatments in real time. The word “durable” is key: it means the authority stays in effect even after you lose the ability to make your own decisions, which is precisely when you need it most.
Having both documents covers more ground than either one alone. The living will handles the situations you anticipated. The healthcare proxy handles everything else.
What Your Healthcare Proxy Can and Can’t Do
The person you name as your proxy gains broad authority. They can consent to, refuse, or withdraw any care, treatment, service, or procedure related to a physical or mental condition. They can access and review your medical records. They can sign documents on your behalf, including forms to refuse treatment or to leave a hospital against medical advice. In short, they step into your shoes and make the same range of decisions you could make if you were able.
That authority has limits, though. A court can strip your proxy of decision-making power if they authorize something illegal, act against your known wishes, or, when your wishes aren’t known, do something clearly contrary to your best interests. You can also set your own limits in the document itself. If you don’t specify any restrictions, your proxy’s powers will be as broad as the law allows.
Choosing the right person matters more than most people realize. Pick someone who understands your values, can stay calm under pressure, and is willing to advocate for what you want even if it conflicts with what family members or doctors prefer.
When an Advance Directive Takes Effect
Your advance directive doesn’t activate the moment you sign it. It only comes into play when you’re determined to lack the capacity to make your own medical decisions. That determination typically involves your doctor assessing whether you can understand relevant information, weigh your options, and communicate a choice. In some frameworks, the standard is whether you can retain information long enough to reach a thoughtful decision, even if that window is as brief as ten minutes.
As long as you can understand your situation and express your preferences, your advance directive stays in the background. You remain in full control of your care. The documents serve as a safety net, not a replacement for your voice.
POLST: A Related but Different Document
You may encounter something called a POLST (physician orders for life-sustaining treatment) or MOLST (medical orders for life-sustaining treatment), depending on your state. This is not the same thing as an advance directive, though the two complement each other.
A POLST is a medical order signed by a healthcare professional. It’s designed for people who already have a serious illness, and it functions like a prescription: emergency responders and hospital staff treat it as an active, actionable set of instructions. Your advance directive, by contrast, is a broader planning document created by you. A POLST doesn’t replace your advance directive. It translates your preferences into the specific clinical language that first responders and ER teams follow in a crisis.
Legal Requirements by State
Every state recognizes advance directives, but the rules for making one legally valid vary. Twenty-two states require witnesses when you sign. Twenty-three states let you choose between using witnesses or a notary. Three states (North Carolina, South Carolina, and West Virginia) require both witnesses and a notary. Idaho and New Mexico recommend witnesses but don’t strictly require them.
If you move or spend significant time in another state, your directive will generally still be honored. Most states explicitly recognize directives executed in other states as validly signed. The catch is that your directive will be interpreted under the laws of the state where it’s actually used, not the state where you signed it. Since states define terms differently and place different limits on proxy authority, your original intentions could be read differently than you intended. If you relocate permanently, creating a new directive that complies with your new state’s specific laws is the safest approach.
How to Create One
You don’t need a lawyer to create an advance directive, though consulting one can help if your situation is complex. Many states offer free standardized forms through their department of health or attorney general’s office. Hospitals and doctors’ offices often have them as well.
The basic steps are straightforward. Decide what treatments you’d want or refuse under different medical scenarios. Choose a healthcare proxy and confirm they’re willing to serve. Fill out your state’s forms. Sign them in front of witnesses or a notary (or both) as your state requires. Then distribute copies to your proxy, your primary care doctor, any specialists you see regularly, and your local hospital. Some states, like California, also maintain registries where you can file your directive for a small fee.
Updating or Revoking a Directive
An advance directive isn’t permanent. You can change or cancel it at any time, as long as you still have the mental capacity to do so. Life events like a new diagnosis, marriage, divorce, or simply a shift in your values are all good reasons to revisit the document.
To revoke a directive, most states allow you to destroy the original, create a new directive that supersedes the old one, or make a clear written or verbal statement that you’re revoking it. If your directive is registered with a state agency, you’ll need to file updated paperwork. In California, for example, revoking or amending a registered directive requires submitting a new registration form with a $10 fee.
Whatever changes you make, notify everyone who has a copy of the old version. An outdated directive floating around in a hospital’s files can create confusion at exactly the wrong moment. Replace old copies with current ones and confirm that your proxy knows about any changes to your preferences.