Re-Diagnosis of Autism: When Diagnostic Criteria Change

The two-domain criteria (social communication + restricted/repetitive behaviours) replaced the three-domain model.

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Re-Diagnosis of Autism: When Diagnostic Criteria Change The two-domain criteria (social communication + restricted/repetitive behaviours) replaced the three-domain model. Sensory differences were added as a diagnostic feature. The DSM-5 says people with a well-established DSM-IV diagnosis of autistic disorder, Asperger’s disorder or PDD-NOS should be given a diagnosis of autism spectrum disorder. Call AccessOAP before booking a new assessment. Ask private providers for a written fee quote. Read the guide www.endthewaitontario.com/answers/re-diagnosis-autism-changing-criteria

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The two-domain criteria (social communication + restricted/repetitive behaviours) replaced the three-domain model. A short explainer with music and captions. 50 seconds.

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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

Primary source Zwaigenbaum L, Bauman ML, Stone WL, et al. (2015) Verified 2015-10-01

1 in 50

According to the 2019 Canadian Health Survey on Children and Youth, about 1 in 50 children and youth aged 1 to 17 in Canada had an autism diagnosis

Primary source Public Health Agency of Canada (2024) Verified 2024-03-26

WHO recommends accessible, community-based early interventions for children with autism. Timely evidence-based psychosocial interventions improve communication and social engagement

Primary source World Health Organization (2025) Verified 2025-09-17
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Last system verification: 2026-11-03. Next scheduled update: 2027-02-01.

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Written by Spencer Carroll

Founder & Autism Advocate

Lived experience: Parent of autistic child in the OAP system