The children waiting for diagnosis
Diagnosis is the entry point — behind every assessment is a family already waiting for services.
Registered
88,175Children registered
Total in the Ontario Autism Program queue
CBC FOI Jan 2026
Funded
20,666Have active funding
Just 23.4% of registered children
CBC FOI Jan 2026
Waiting
67,509Still waiting
Registered. Diagnosed. Un-funded.
CBC FOI Jan 2026
Verified — CBC FOI Jan 2026
| Metric | Value |
|---|---|
| Children registered | 88,175 |
| Have active funding | 20,666 |
| Still waiting | 67,509 |
Autism assessments in Ontario use the "gold standard" combining three methods: ADI-R parent interview about developmental history, ADOS-2 observation of the child in structured play, and clinician synthesis of all evidence. This convergence approach takes 4-6 hours across multiple sessions.
Clinicians look for convergence of evidence across three areas:
Tool: ADI-R
A structured interview about your child's developmental history from birth to now.
Tool: ADOS-2
A play-based session where the clinician interacts with your child to observe communication and social skills.
Tools: Questionnaires
Forms sent to you and your child\'s teacher (if applicable) to see how they function in different environments.
A full autism assessment takes 4-6 hours across 2-3 appointments: intake interview (1-1.5 hours), ADOS-2 observation session (1-2 hours), parent interview (1-1.5 hours), and feedback session where results are discussed. Both public and private follow this multi-appointment format.
Whether public or private, the process usually spans 2-3 separate appointments.
Being prepared reduces stress and helps the clinician complete the assessment efficiently. Gather these items before your first appointment:
Autism assessment costs vary: OHIP-covered (free but 18-24+ month wait), private psychologist ($2,500-$4,500, 2-6 month wait), or multidisciplinary clinics ($3,500-$5,500 with SLP/OT input). Private fees are tax-deductible and partially covered by some extended health insurance plans.
The tools and methods used are similar whether you go public or private. The difference is access and cost:
Private assessment fees are claimable as medical expenses on your income tax return. Some extended health insurance plans reimburse part of the cost under "psychological services."
For young children, yes, a parent is usually in the room but asked to sit quietly in the corner and not intervene unless asked. The clinician needs to see how the child interacts with them, not just you. For older teens, they may go in alone.
Sometimes a child has complex needs (ADHD, anxiety, trauma) that look like autism. A "watch and wait" approach might be suggested, or a referral to a different specialist. This is frustrating, but accurate diagnosis matters for getting the right support.
From intake to receiving the final written report, expect 4-8 weeks for private assessments and 2-4 months for public. The actual testing takes 4-8 hours spread across 2-3 appointments. The written report is the document you need to register for the Ontario Autism Program (OAP) through AccessOAP.
Experienced clinicians expect variability. The ADOS-2 is designed to create opportunities for social interaction — it is not a pass/fail test. If the child is too distressed to participate (illness, extreme anxiety), the clinician will typically reschedule rather than force a session that would not yield useful data.
Related Resources
Commitment to Accuracy: Our data is verified against official government reports (FAO, MCCSS), peer-reviewed scientific literature, and accessible public records. Last updated: March 24, 2026.
Verified Facts
Evidence supports autism screening and intervention commencing in the first 2 years of life — earlier identification directly enables earlier intervention during the highest neural plasticity window
1 in 50 — According to the 2019 Canadian Health Survey on Children and Youth, about children and youth aged 1 to 17 in Canada had an autism diagnosis
WHO recommends accessible, community-based early interventions for children with autism — timely evidence-based psychosocial interventions improve communication and social engagement
88,175 — children are registered in the Ontario Autism Program
23.4% — Only 20,666 children have active funding agreements () — less than one in four
The journey from initial intake to final diagnostic report. Here is exactly what happens in the room during the "Gold Standard" evaluation process.
Goal: To gather the full developmental history.
You will be asked detailed questions about milestones (walking, talking), pregnancy, sleeping habits, and specific behaviors. Tip: Bring your "Baby Book" or old videos if you have them.
Goal: To see how your child communicates and plays.
The clinician will administer the ADOS-2. It feels like playing. There are different "Modules" depending on your child's speech level (Module 1 for non-speaking, up to Module 4 for fluent adults).
Goal: To explain the results and provide the report.
You will be told if your child meets the DSM-5 criteria for Autism Spectrum Disorder. You will receive a detailed written report. Do not leave without knowing when you will get the written copy—you cannot register for OAP without it.
Many parents worry: "What if my child masks?" or "What if they have a 'good day' and act neurotypical?" Trained clinicians know how to look past masking. They look for the quality of social overtures, not just their presence. The ADOS-2 is specifically designed to create "presses" for communication that reveal underlying differences.