Informed Consent — Ontario
Sourced from Canadian federal statutes and official sources. Provincial information reflects each province's own legislation and court rulings. Written in plain language for general understanding — this is educational content, not legal advice. Our editorial standards
What is this right?
Before any treatment, the law requires the doctor to give you enough information to make a real decision. The Supreme Court's Reibl v. Hughes (1980) and Hopp v. Lepp (1980) anchor this duty in Canadian law. The information has to cover:
- The nature of the treatment
- Expected benefits
- Material risks and side effects
- Alternatives, including doing nothing
- The consequences of refusing
Consent must be voluntary. Pressure invalidates it. And capacity is judged per decision — you can be capable of consenting to one treatment and not another, on the same day.
If you're found incapable, a substitute decision-maker (SDM) steps in. The hierarchy runs: guardian, power of attorney for personal care, spouse, adult child. The SDM's job isn't to do what they'd want — it's to do what you would have wanted.
In a genuine emergency, a doctor can treat without consent if you are incapable and no SDM is available. That carve-out is narrow.
When does it apply?
- Every patient in Canada, regardless of age or status.
- Applies to any proposed treatment, procedure, diagnostic test, hospital admission, or research study.
What to Do If a Canadian Doctor Treated You Without Your Informed Consent
- Ask questions. Persistently. You have the right to understand the treatment before agreeing.
- Request written information on your diagnosis, options, and risks.
- Designate a power of attorney for personal care while you're still capable. Future-you will thank present-you.
- Create an advance directive for the treatments you do or don't want.
- If you believe your consent rights were violated, contact a patient ombudsman for the province.
What should you NOT do?
- Don't sign consent forms without reading them. Take the time. The form is the record.
- Don't assume silence is consent. The doctor needs a clear yes.
- Don't let yourself be rushed outside genuine emergencies where delay would be life-threatening.
- Don't forget you can withdraw consent at any time — even after you've signed, even mid-procedure where it's safe to stop.
How Ontario differs from federal law
Ontario's Health Care Consent Act, 1996 (HCCA) sets out detailed rules for informed consent to treatment, which go beyond the common law principles.
- A health care provider cannot treat you without your informed consent (or the consent of your substitute decision-maker). Consent must be: related to the treatment, given voluntarily, and not obtained through misrepresentation or fraud.
- To give informed consent, you must be told: the nature of the treatment, the expected benefits, the material risks and side effects, alternative treatments, and the likely consequences of not having the treatment (section 11 of the HCCA).
- You have the right to refuse treatment, even if refusing could result in your death — as long as you are mentally capable of making the decision.
- If you are incapable of consenting, your substitute decision-maker (SDM) consents on your behalf. Ontario has a hierarchy of SDMs: guardian, attorney for personal care (under a power of attorney), certain family members in a specific order.
- You can create a Power of Attorney for Personal Care under the Substitute Decisions Act, 1992 to name someone you trust to make health decisions if you become incapable.
- Disputes about consent or capacity can be brought to the Consent and Capacity Board — an independent tribunal that conducts hearings, often within 7 days.
Additional Steps in Ontario
Ask questions before any treatment. If you feel you were treated without proper consent, you can file a complaint with the College that regulates your health care provider (e.g., College of Physicians and Surgeons of Ontario for doctors). If you disagree with a finding of incapacity, you or your representative can apply to the Consent and Capacity Board at 1-866-777-7391. Consider creating a Power of Attorney for Personal Care while you are capable.
Relevant Law: Health Care Consent Act, 1996, S.O. 1996, c. 2, Sched. A, ss. 10–18; Substitute Decisions Act, 1992, S.O. 1992, c. 30
Common Questions
What is the informed consent right in Canada?
Before any treatment, the law requires the doctor to give you enough information to make a real decision. The Supreme Court's Reibl v. Hughes (1980) and Hopp v. Lepp (1980) anchor this duty in Canadian law. The information has to cover:The nature of the treatmentExpected benefitsMaterial risks and side effectsAlternatives, including doing nothingThe consequences of refusingConsent must be voluntary. Pressure invalidates it. And capacity is judged per decision — you can be capable of consenting to one treatment and not another, on the same day.If you're found incapable, a substitute decision-ma...
When does informed consent apply?
Every patient in Canada, regardless of age or status.Applies to any proposed treatment, procedure, diagnostic test, hospital admission, or research study.
What should I do if a doctor in Canada performed a procedure without properly explaining the risks or getting my consent?
Ask questions. Persistently. You have the right to understand the treatment before agreeing.Request written information on your diagnosis, options, and risks.Designate a power of attorney for personal care while you're still capable. Future-you will thank present-you.Create an advance directive for the treatments you do or don't want.If you believe your consent rights were violated, contact a patient ombudsman for the province.
What mistakes should I avoid with informed consent?
Don't sign consent forms without reading them. Take the time. The form is the record.Don't assume silence is consent. The doctor needs a clear yes.Don't let yourself be rushed outside genuine emergencies where delay would be life-threatening.Don't forget you can withdraw consent at any time — even after you've signed, even mid-procedure where it's safe to stop.
Informed Consent in other states
Same topic, different jurisdiction. Pick the one that applies to you.