NWT Substitute Decision Maker: Who Decides When You Can't

What a Substitute Decision Maker Does

When a patient in the Northwest Territories is unable to make their own treatment decisions — because of a psychiatric admission, a sudden medical crisis, or a cognitive condition — someone else needs the legal authority to consent to or refuse treatment on their behalf. That person is a Substitute Decision Maker (SDM).

The SDM system under the NWT's Mental Health Act is a last-resort mechanism. It exists for situations where the patient has no Personal Directive naming an agent, no court-appointed guardian, and no other advance planning in place. It fills the gap, but it's narrower and more temporary than most families expect.

The Priority List

When a physician determines that a patient under a Treatment Decision Certificate needs an SDM, they don't get to pick whoever seems most appropriate. The Mental Health Act prescribes a strict priority hierarchy:

1. A person with lawful custody or authority (relevant for minors)
2. A court-appointed legal guardian
3. An agent appointed under a Personal Directive
4. The nearest capable relative, in this order:
   • Spouse
   • Adult child (oldest first)
   • Parent
   • Sibling (oldest first)
   • Grandparent
   • Grandchild
   • Aunt or uncle
   • Niece or nephew
5. An adult friend

The physician works down the list. The first available person who qualifies is designated as SDM. They can't skip the spouse to pick an adult child who lives closer, and they can't choose a friend over a sibling just because the friend knows the patient better.

Qualification Requirements

Being high on the priority list isn't enough. The designated SDM must also:

• Be willing to act — they must sign a legal form confirming their consent to serve
• Be mentally competent to make treatment decisions
• Have had personal contact with the patient within the previous 12 months — someone who hasn't seen or spoken to the patient in over a year cannot serve

If the highest-priority person doesn't meet all three requirements, the physician moves to the next person on the list.

What SDM Authority Covers (and What It Doesn't)

SDM authority is narrow and temporary. It covers:

• Consenting to or refusing specific medical treatments prescribed under the Treatment Decision Certificate
• Making decisions about psychiatric treatment during the admission

It does not cover:

• General healthcare decisions outside the scope of the certificate
• Financial decisions of any kind (bank accounts, bill payments, property)
• Long-term care placement decisions
• Day-to-day personal care decisions
• Any decisions after the certificate expires or is cancelled

The authority terminates automatically when the Treatment Decision Certificate is cancelled, the patient is discharged, or the patient regains capacity. Once it ends, the SDM has no continuing legal authority.

SDM vs. Personal Directive Agent

The SDM system is an emergency fallback. A Personal Directive is a planned delegation. The differences are significant:

The practical implication: if you have a Personal Directive naming an agent, your chosen person makes healthcare decisions according to the specific preferences you documented. Without one, a physician picks the SDM from the statutory list, and that person makes decisions based on their own judgment about your best interests.

SDM vs. Power of Attorney

Families frequently confuse the SDM with the attorney under a power of attorney. They're completely different roles:

• The SDM makes healthcare/treatment decisions (personal domain)
• The attorney under a POA makes financial/property decisions (financial domain)
• They operate under different legislation
• They're appointed through different mechanisms
• Neither one can cross into the other's domain

An SDM cannot access the patient's bank accounts. An attorney cannot consent to medical treatment.

When the SDM System Breaks Down

Several scenarios regularly cause problems with the SDM pathway in the NWT:

No qualifying person available. In a fly-in community with a small population, the patient may have no spouse, no adult children nearby, and no relatives who've had contact within the past year. The physician must then look to "an adult friend" — a category that can be difficult to document in a clinical setting.

Family disagreement. The spouse may disagree with the medical team's recommendation, or adult children may disagree with each other about what treatment the patient would want. The SDM system designates one person — it doesn't provide a mechanism for resolving internal family disputes.

The 12-month contact rule. A daughter in Edmonton who talks to her mother in Yellowknife weekly by phone qualifies. A son in Vancouver who hasn't visited in 18 months doesn't — even if he's otherwise the most suitable candidate.

Transition to long-term needs. The SDM's authority is temporary. When the immediate crisis passes but the patient still can't make decisions independently, the family needs either a Personal Directive (if the patient regains capacity to sign one) or a court-ordered guardianship — the SDM pathway doesn't extend to long-term care management.

The Mental Health Act Review Board

If the patient, the SDM, or any interested party believes that rights have been violated during the treatment process, they can apply for a formal hearing before the Mental Health Act Review Board. The board consists of a lawyer, a physician, and a layperson.

Once an application is filed, no non-emergency treatment decisions can be made until the panel conducts a hearing and issues a binding decision. This is a meaningful safeguard — but it also means treatment can be delayed during the review process.

Planning Ahead Eliminates the SDM Question

The SDM system is designed for emergencies. It works, but it gives you no control over who makes decisions or what preferences they follow. A Personal Directive and a power of attorney together replace the SDM pathway entirely — you choose your decision-makers, document your preferences, and create a direct chain of authority that hospitals and banks must honour.

Our Northwest Territories Power of Attorney Kit covers both the financial (POA) and healthcare (Personal Directive) planning process, ensuring your family never needs to rely on the SDM hierarchy.

See more Northwest Territories guides →