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Form 3 (6429-41)

Certificate of Involuntary Admission

Certificat d'admission en cure obligatoire

A Form 3 follows a psychiatric assessment, usually after a Form 1, when the attending physician concludes the person needs to stay in hospital and isn't suitable for voluntary status. It rests on the physician's own examination against the Box A or Box B criteria, and it allows detention for up to two weeks.

At a glance

Checked October 2026

Form number
Form 3 (6429-41)
Issued by
Ontario Ministry of Health
Where
Ontario
Completed by
Attending physician at the psychiatric facility
Format
Fillable PDF
Language
English and French

What the Form 3 is for

The Form 3 makes a person an involuntary patient in a psychiatric facility. Under section 20 of the Mental Health Act, after observing and examining someone held on a Form 1 or a section 32 order, the attending physician must release them, admit them as an informal or voluntary patient, or admit them involuntarily on this certificate. A Form 3 authorizes detention, restraint, observation and examination for up to two weeks.

It’s often confused with the Form 1, which only authorizes 72 hours of assessment, and with the Form 4, which renews an existing certificate.

Who completes it

The attending physician at the psychiatric facility completes and signs it after personally examining the patient. It can’t be the physician who signed the Form 1. The patient doesn’t complete any part, but they must receive a Form 30 notice afterwards.

How to fill in the certificate

Patient, physician, facility and examination date

Print the patient’s name, your name, the psychiatric facility, and the date of your examination. The certificate opens with three statements you’re certifying: that you personally examined the patient on that date, that they aren’t suitable for voluntary or informal status, and which box they meet.

Box A: risk of serious harm

Check one or more outcomes the mental disorder will likely cause unless the patient stays in custody: serious bodily harm to the patient, serious bodily harm to another person, or serious physical impairment of the patient.

Box B: incapable patients who meet the specified criteria

All five criteria must be met. The patient has been found incapable of consenting to treatment in a psychiatric facility, and their substitute decision-maker has consented. They previously received treatment for a recurring disorder and improved with it. They now have the same or a similar disorder, and given their history and current condition they’re likely to come to serious harm or substantial deterioration. Missing any one of the five means Box B can’t be used.

Signature and date

Sign and date the certificate. The 14 days run from and include the day of signature, so note the date carefully for the renewal.

Common reasons it’s found defective

  • Completed by the same physician who signed the Form 1.
  • No box selected, or Box B selected when one of the five criteria isn’t met.
  • Box B used without a finding of incapacity or the substitute decision-maker’s consent.
  • Missing examination date or signature date.
  • The Form 30 notice and rights adviser notification not done promptly after signing.

Submitting and who pays

The certificate is completed and filed with the officer in charge of the facility, who reviews it for compliance. A copy goes in the hospital record. OHIP pays the physician under fee code K624, certification of involuntary admission, which includes the history, examination, notifications, and completing the form.

Get the official form

Download the current version from Ontario Ministry of Health each time. Forms change without notice, and an old edition can be returned.

Official page ↗ PDF ↗ Version française ↗

Medulla Forms

Fill Form 3 (6429-41) from the visit and the chart.

Upload the fillable PDF to your practice's forms once. Medulla fills it from the visit and the chart open in your EMR, leaves blank anything the record doesn't support, and opens the form for your review. When it's done, save it to the patient's chart in one click.

Free 1-month trial. No credit card required.

Sources for this guide

Questions

Questions we hear a lot.

How long does a Form 3 last?

The certificate is valid for 14 calendar days, including the day it's signed. To keep the patient involuntary after that, the attending physician must complete a certificate of renewal, the Form 4, before it expires.

Can the physician who signed the Form 1 complete the Form 3?

No. The Mental Health Act requires a different physician. The Form 3 is completed by the attending physician at the facility after their own examination.

What has to happen after a Form 3 is signed?

The signing physician must promptly give the patient a Form 30 notice and notify a rights adviser. The rights adviser then meets the patient to explain the certificate and the right to a Consent and Capacity Board hearing.

What happens if the Form 3 is filled in wrong?

The officer in charge reviews every certificate. If it isn't properly completed, they tell the attending physician, and unless the patient is re-examined and released or admitted properly, the officer in charge must release them.

Is patient information secure?

Yes. Medulla has a SOC 2 Type II report from an independent auditor, is HIPAA, PIPEDA, and PHIPA compliant, and is built and hosted in Canada, so patient data stays in the country and never gets pasted into consumer AI tools. Everything is encrypted in transit and at rest. See how we protect patient data.

More questions? Browse help.medulla.ca.