An advance directive is a legal document that spells out your wishes for medical care if you ever become unable to speak for yourself. It only takes effect when you can’t communicate your own decisions, whether from unconsciousness, severe illness, or cognitive decline. The two most common types are a living will and a durable power of attorney for healthcare, and they serve different but complementary purposes.
Despite their importance, only about one in three U.S. adults has completed any type of advance directive. That number is roughly the same for healthy adults (33%) and people already living with chronic illness (38%), based on a large systematic review of over 795,000 people. Understanding what these documents do, and how they differ from other medical orders, can help you decide what’s right for your situation.
Living Will: Documenting Your Treatment Preferences
A living will is a written legal document that details the specific medical treatments you would or wouldn’t want used to keep you alive. It also covers related decisions like pain management and organ donation. The goal is to give your medical team clear guidance when you can’t provide it yourself.
The treatments most commonly addressed in a living will include:
- CPR and defibrillation: whether you want your heart restarted if it stops beating
- Mechanical ventilation: whether you want a breathing tube and ventilator if you can’t breathe on your own
- Tube feeding: whether you want nutrition delivered through a tube if you can’t eat
- Antibiotics: whether you want aggressive infection treatment in certain end-of-life scenarios
- Pacemakers and implantable defibrillators: whether you want devices that regulate your heartbeat
A living will doesn’t just list yes or no answers. You can specify the conditions under which each choice applies. For example, you might want ventilator support if recovery is likely but not if you’re in a permanent vegetative state. The more specific you are, the easier it is for your care team to honor your wishes.
Healthcare Power of Attorney: Naming a Decision-Maker
A durable power of attorney for healthcare names a specific person, called your healthcare proxy or agent, who can make medical decisions on your behalf when you’re unable to. This person gains the legal authority to speak with your doctors, access your medical records, and authorize or refuse treatments based on what they believe you would want.
A few important details about how this works in practice. As long as you can make decisions for yourself, you always direct your own care, even if you’ve already signed this document. Your agent only steps in when you become incapacitated. The agent has a legal obligation to act in your best interest, not according to their own preferences. And a healthcare power of attorney is entirely separate from a financial power of attorney. Naming someone to manage your medical decisions does not give them any authority over your money or property.
There are two common structures. A “durable” power of attorney takes effect as soon as the document is signed, meaning your agent can begin acting on your behalf immediately if needed. A “springing” power of attorney only activates after a physician formally declares you incapacitated. The right choice depends on your health situation and how much flexibility you want your agent to have.
DNR and DNI Orders
Two specific types of advance directives come up frequently: do-not-resuscitate (DNR) and do-not-intubate (DNI) orders. A DNR tells your medical team not to perform CPR or use a defibrillator if your heart stops beating or you stop breathing. A DNI tells them not to place a breathing tube or connect you to a ventilator if you can’t breathe on your own.
Without these orders in place, healthcare providers will do everything they can to save your life by default. That includes chest compressions, electric shocks to the heart, and mechanical breathing support. A DNR or DNI overrides that default and reflects a deliberate choice, typically made by someone with a serious or terminal illness who has weighed the likelihood of meaningful recovery against the burden of aggressive intervention.
How a POLST Differs From an Advance Directive
A POLST (Physician Orders for Life-Sustaining Treatment) is sometimes confused with an advance directive, but it serves a different function. An advance directive is for all adults regardless of health status and records your general preferences for possible future scenarios. A POLST is a set of actual medical orders, signed by a physician, designed for people with a serious illness or frailty where death within the next year or two would not be surprising.
The practical differences matter. An advance directive generally does not apply to emergency care. A POLST does. Emergency medical responders are trained to follow POLST orders on the scene. A POLST also converts your broad goals into specific instructions for critical care decisions: whether to attempt resuscitation, use a ventilator, provide tube feeding, or administer antibiotics. For someone with an advancing illness, having both documents means your general values are on record through your advance directive, and your POLST translates those values into actionable orders for your current medical situation.
How to Make Your Directive Legally Valid
Requirements vary by state, but most states require you to be at least 18 years old and follow specific signing procedures. In many states, your advance directive must be notarized, and you’ll need two witnesses present in addition to the notary. You, your witnesses, and the notary all need to be at the same appointment when the document is signed.
There are restrictions on who can serve as a witness. Your witnesses generally cannot be your healthcare proxy, your physician, an employee of your physician, your current caretaker, or anyone who stands to inherit from your estate. These rules exist to prevent conflicts of interest and ensure the document reflects your genuine wishes without outside pressure.
Making Sure Your Directive Is Accessible
An advance directive is only useful if the people who need it can find it. Give copies to your healthcare proxy, your primary care doctor, and any specialists managing ongoing conditions. If you’re admitted to a hospital, make sure the admitting team knows you have one and that a copy is added to your medical record.
Keep the original in a place that’s easy to locate but not locked away. A safe deposit box, for instance, may be too difficult to access in an emergency. Some people carry a wallet card noting that they have an advance directive and listing where to find it, along with their proxy’s contact information. Several states also maintain electronic registries where you can upload your documents so hospitals can access them directly.
Why Advance Directives Affect End-of-Life Care
Having an advance directive doesn’t just offer peace of mind. It changes the kind of care people actually receive. Research on Medicare patients who engaged in advance care planning found that they were significantly more likely to use hospice services and substantially less likely to die in the hospital. Inpatient spending in the last 30 days of life dropped meaningfully for those with documented plans.
This pattern makes sense: when your preferences are clearly documented, care shifts toward what you actually want rather than defaulting to the most aggressive treatment available. For many people nearing end of life, that means more comfort-focused care, earlier enrollment in hospice, and fewer unwanted hospital stays. For families, it removes the agonizing burden of guessing what their loved one would have chosen.
Advance directives can also be updated at any time. If your health changes, your values shift, or you simply reconsider a decision, you can revise the document. The most recent valid version always takes priority. Revisiting your directive periodically, especially after a major diagnosis or life change, keeps it aligned with what you truly want.