POST vs. Advance Directive: Main Differences You Need to Know
Who speaks for you in a medical crisis, and what care do you actually want in that moment? Planning ahead gives your loved ones clear direction and spares them from guessing under pressure.
At Foust & Foust, PLLC, our work centers on estate planning, probate, and trust administration for Tennessee families. In this article, we break down how an Advance Directive and a POST or POLST work, and how they fit together.
Our goal is simple: give you plain-English guidance so your wishes show up in the right document at the right time. You will see where each tool helps and how both can support your broader estate plan.
What is an Advance Directive?
An Advance Directive is a legal document where you outline your healthcare wishes, and often, pick a person to speak for you if you cannot. It is used to guide future decisions when you are unable to communicate, such as during surgery complications or after a serious stroke. Every adult benefits from having one, even those in good health.
At our firm, these documents usually include a living will and a healthcare power of attorney. Together, those parts describe your values around life support, pain control, and end-of-life choices, then name the trusted decision-maker who can talk with doctors.
Having this in writing reduces family stress and helps your medical team follow your goals for care.
What is a POST or POLST (Physician Orders for Life-Sustaining Treatment)?
A POST, sometimes called POLST, MOST, or MOLST in other states, is a medical order that tells clinicians exactly what to do in a crisis. It is designed for people living with serious illness or advanced frailty, where urgent choices about CPR, ventilation, or transfers are likely. A healthcare professional completes and signs the form after a conversation with you or your surrogate.
The POST translates your goals into orders that emergency teams can act on right away. That is why EMS will honor it at home, in a facility, or during transport. Think of POST as the action plan for tonight, not a long-range plan for the next decade.
With those basics in place, we can compare how POST or POLST and Advance Directives differ and how they work together.
Key Differences Between POST and Advance Directives
Both tools communicate your wishes, yet they play different roles at different times. The points below explain the scope, timing, and who completes each document.
| Topic | Advance Directive | POST or POLST |
| Type | Legal document | Medical order |
| Who completes | Individual, with witnesses or a notary | Healthcare professional after a goals-of-care talk |
| Who it is for | All capable adults | People with serious illness or frailty |
| Scope | General values and future wishes | Specific treatments to use or avoid in a crisis |
| EMS use | Not used by EMS | Honored by EMS |
| Surrogate named | Yes, a healthcare agent | No, though agent input is common |
| DNR link | Can state resuscitation wishes | Can include a DNR order |
| Portability | Kept with personal papers and in the medical chart | Posted and carried, sometimes entered in a registry |
| Review cycle | Any time your wishes change | At health changes, transfers, or routine check-ins |
Purpose and Scope
An Advance Directive covers a broad range of choices, from comfort-focused care to life support preferences, and it names who should decide for you. It is a guide for future care across many settings. A POST zeroes in on immediate treatments in a likely crisis, such as CPR, intubation, antibiotics, or artificial feeding.
Both are helpful, yet they answer different questions. One offers overall guidance for tomorrow; the other gives exact orders for tonight.
Document Type
An Advance Directive is are legal document that expresses your wishes and appoints a decision-maker. Medical staff use it to shape a care plan once your condition is evaluated. A POST is a signed medical order that clinicians and EMS follow at the moment, which is why it must be completed by a qualified professional.
This difference explains why POST works in emergencies, while Advance Directives guide care after you reach the hospital.
Who Completes the Document
You complete your Advance Directives, then sign with witnesses or a notary as your state requires. You can update it on your own later. A POST is completed by a physician, nurse practitioner, or physician assistant after a conversation about diagnosis, risks, and goals.
That talk covers likely outcomes, the burdens of treatments, and what support you want if your condition worsens.
Applicability
Advance Directives fit every adult, from college students to retirees. They give your chosen agent authority when you cannot speak. POST forms fit those who face high medical risk from serious illness or frailty, where urgent decisions are expected.
If you are healthy, focus on your Advance Directive first. If your health shifts, your clinician can advise whether POST or POLST makes sense.
Portability and Emergency Use
POST forms are portable and easy for EMS to find, often printed on brightly colored paper or stored in a registry. Paramedics can act on them during a 9-1-1 call. Advance Directives usually are not followed by EMS because they are guidance, not orders.
Once a doctor fully evaluates you, the Directive still shapes the treatment plan in the hospital or facility.
Surrogate Decision-Making
Advance Directives let you name a healthcare agent, sometimes called a surrogate. This person speaks with clinicians, asks questions, and approves care that aligns with your values. POLST forms do not name a surrogate, yet they can be created with your agent’s input if you lack capacity.
Teamwork helps align the medical orders with your prior wishes.
Relationship to DNR (Do Not Resuscitate) Orders
A POST can include a DNR order that tells teams not to perform CPR if your heart stops. The same form can address other treatments, such as ventilation or feeding tubes. Advance Directives can state your preferences about resuscitation and life support, which then guide the agent and doctor when building the plan of care.
Used together, the Directives give the big picture, and the POST carries out the exact orders in a crisis.
To make this practical, it helps to picture common choices that show up on a POST.
● CPR or no CPR if breathing or heartbeat stops.
● Full treatment, selective treatment, or comfort-focused care only.
● Use of ventilation, antibiotics, or artificial nutrition, including time limits.
These selections reflect quality-of-life goals that often start in your Advance Directive conversation.
How to Obtain a POST Form
Names vary by state, including POST, POLST, MOST, and MOLST. In Tennessee, you can ask your clinician about a POST if your health status calls for it.
- Schedule time with your physician, nurse practitioner, or physician assistant to talk through your condition and goals.
- Bring your Advance Directive and the name of your healthcare agent. That context helps your clinician write orders that fit your values.
- Review any state form your provider uses, then sign. Keep a copy on the fridge or bedside and give copies to family and caregivers.
Before that visit, you can review your state’s form online to get familiar with the sections. Ask where the form will be stored in your record and whether a registry entry is available.
When to Review and Update These Documents
Life and health change, so your documents should keep up. Set a simple trigger list and stick to it.
● Every 2 years to keep the documents updated and current.
● New diagnosis, major decline, or recovery that changes goals of care.
● Hospitalization, move to or from a care facility, or a 9-1-1 call.
● New caregiver, new healthcare agent, or a move across state lines.
● Births, deaths, marriages, or other family changes that shift who should decide for you.
During each check-in, confirm your agent still knows your wishes and has copies. For POST or POLST, ask your clinician to review the orders after any big health event or transfer.
Need Assistance with Estate Planning? Contact Foust & Foust, PLLC, Today
Clear instructions for medical care work best when they sit inside a thoughtful estate plan. At Foust & Foust, PLLC, we focus on practical, personal solutions that fit real families, including Advance Directives, powers of attorney, and related planning. Feel free to call us at 865-203-4041, email contact@foustlaw.com, or visit our website to set up a time to talk.
We welcome your questions, whether you are just getting started or updating a long-standing plan. Our team works to protect your wishes and lighten the load on the people you trust most. A short conversation now can bring real peace of mind later for you and your family.
