A healthcare directive is a legal document that spells out your preferences for medical treatment if you ever become unable to speak for yourself. It can also name someone you trust to make those decisions on your behalf. The term is an umbrella that covers several related documents, most commonly a living will and a healthcare power of attorney. Only about one-third of U.S. adults have completed one, even though any adult can create one at any age.
The Two Main Types
When people say “healthcare directive” or “advance directive,” they’re usually referring to one or both of two documents that serve very different purposes.
A living will is a written document that details the specific medical treatments you would or would not want used to keep you alive. It covers decisions like whether you want to be placed on a breathing machine, receive CPR, or be given artificial nutrition through a feeding tube. It can also address preferences around pain management and organ donation. A living will only takes effect when you can no longer communicate your own choices.
A healthcare power of attorney (sometimes called a durable power of attorney for healthcare or a healthcare proxy, depending on the state) names a specific person to make medical decisions for you. This person, often called your agent or surrogate, steps in when your medical team determines you lack the capacity to decide for yourself. Unlike a living will, which covers only the scenarios you anticipated in writing, a healthcare power of attorney gives your chosen person the flexibility to respond to unexpected situations.
Most experts recommend having both. The living will provides clear guidance on your values and wishes. The healthcare power of attorney fills in the gaps for anything the living will doesn’t address.
What Decisions a Directive Can Cover
A healthcare directive can address a wide range of medical scenarios. The most common include:
- Resuscitation: Whether you want CPR attempted if your heart stops.
- Mechanical ventilation: Whether you want a machine to breathe for you if you can’t breathe on your own.
- Tube feeding and IV hydration: Whether you want to receive nutrition and fluids artificially if you can no longer eat or drink.
- Pain management: How aggressively you want pain treated, even if those treatments might have side effects like sedation.
- Organ and tissue donation: Whether you want to donate organs after death.
- Comfort care preferences: Whether you’d prefer treatment focused entirely on keeping you comfortable rather than extending your life.
You don’t have to address every possible scenario. The goal is to capture enough of your values and specific wishes that your medical team and family can make informed decisions that reflect what you would have chosen.
How POLST Forms Differ
Several states use an additional document called a POLST (Physician Orders for Life-Sustaining Treatment). Depending on the state, it may go by other names: MOLST, MOST, POST, or COLST. These forms serve a different purpose than a standard advance directive.
A POLST is a medical order, signed by both you and a clinician, that translates your wishes into specific instructions emergency responders and hospital staff can act on immediately. One of its original purposes was to give paramedics a clear, actionable document during emergencies, when there’s no time to interpret a longer living will. A standard advance directive, by contrast, is a legal document that guides decision-making over time but isn’t formatted as a medical order.
POLST forms are typically used by people with serious illnesses or those who are elderly and want to ensure their treatment preferences are followed in an emergency. They complement, but don’t replace, a broader advance directive.
When a Directive Takes Effect
A healthcare directive sits dormant until a qualified healthcare professional determines that you lack the capacity to make your own medical decisions. Capacity, in this context, means the ability to understand the potential benefits and harms of a proposed treatment, consider alternatives, and communicate a choice.
This determination is made by your treating clinician, not by family members or a court. In nearly every state, healthcare professionals are legally empowered to make this assessment under advance directive laws. The process is documented in your medical record. If you regain the ability to make your own decisions, the directive steps back and your own voice takes priority again.
It’s worth noting that losing capacity can be temporary. Someone might be unconscious after surgery and unable to communicate for a few hours, then fully capable of making decisions the next day. A directive covers those windows, not just permanent conditions.
Making It Legally Valid
Requirements vary by state, but most states require that you sign the document while you are of sound mind and not under pressure from anyone else. Many states require witnesses, and some require notarization instead of or in addition to witnesses.
Witness rules can be strict. In California, for example, witnesses must be adults who are not your healthcare provider, not an employee of your healthcare provider, and not the person you’re naming as your agent. At least one witness must be someone who is not related to you by blood, marriage, or adoption and who has no claim to your estate. Witnesses must declare under penalty of perjury that you appeared to be of sound mind and free from undue influence.
Other states have their own specific requirements. It’s important to follow the rules for the state where you live, since a directive that doesn’t meet your state’s formal requirements may not be enforceable.
Choosing Your Healthcare Agent
If you include a healthcare power of attorney, the person you name as your agent carries real responsibility. This person will need to advocate for your wishes in high-pressure moments, sometimes disagreeing with other family members or pushing back on a medical team’s recommendation.
Pick someone who knows your values well, can stay calm under stress, and is willing to follow your stated preferences even if they personally disagree. It’s also practical to choose someone who lives nearby or can get to you quickly in an emergency. Name an alternate agent in case your first choice is unavailable.
The most important step after choosing someone is actually talking to them. A document on paper means far less if your agent has never heard you explain your reasoning. Tell them not just what you want, but why.
Changing or Revoking a Directive
You can update or cancel your healthcare directive at any time, as long as you still have the mental capacity to do so. There is no limit on how many times you can revise it. Life changes, like a new diagnosis, a marriage, or a shift in your values, are natural reasons to revisit what you’ve written.
To revoke a directive, most states allow you to simply destroy the document, create a new one that supersedes the old version, or state verbally in front of witnesses that you’re revoking it. When you do update your directive, make sure every person who has a copy, including your agent, your doctor’s office, and any family members, receives the new version. An outdated copy floating around can create confusion at exactly the wrong moment.
Where to Keep It
A healthcare directive is useless if no one can find it when it’s needed. Give copies to your healthcare agent, your primary care doctor, and any close family members who might be involved in your care. If you’re being admitted to a hospital or moving into a care facility, bring a copy so it can be added to your medical record.
Some states maintain electronic registries where you can upload your directive so that hospitals and emergency responders can access it digitally. Check whether your state offers this option. Keeping the original in a fireproof safe at home is reasonable, but don’t lock it somewhere no one else can access. The whole point of the document is that someone else needs to use it when you can’t.