Clinical resource · 2026

Adult ADHD & autism assessment.

A referral guide for Ontario family physicians, nurse practitioners and primary-care teams.

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One-page professional tool

Adult neurodevelopmental assessment referral checklist

A referral is more useful when it describes the question and functional pattern rather than relying on a screening score.

The specific diagnostic or functional question—and why clarification is needed now
Current difficulties across work, education, home, relationships, and daily functioning
Developmental history, including childhood attention, social-communication, sensory, routine, and learning patterns
Relevant psychiatric, medical, sleep, substance-use, trauma, medication, hearing, and vision considerations
Prior diagnoses, assessments, treatment trials, school records, IEPs, and accommodation history
Available collateral source and whether the patient consents to contact
Any urgent safety, capacity, or acute medical concern requiring a different pathway
The external decision or documentation requirement, deadline, and receiving organization

When focused assessment may be appropriate

Adult neurodevelopmental referral questions
Question	Patterns worth documenting	Broader questions to consider
ADHD	Developmentally persistent attention regulation, impulsivity, activity-level or executive-function difficulty with current impairment	Sleep, substance use, mood, anxiety, trauma, medical contributors, learning
Autism	Developmental social-communication differences plus restricted/repetitive patterns, routines, interests or sensory experiences	Social anxiety, trauma, ADHD, language, intellectual or adaptive functioning
Both	A developmental pattern spans both domains and one condition does not fully explain function	Integrated assessment rather than serial screen-based conclusions
Broader assessment	Learning, cognitive, mood, trauma or complex diagnostic questions materially affect the referral	Psychoeducational, psychodiagnostic, medical, psychiatric or interdisciplinary pathway

A screening score is not the diagnosis

For ADHD, review developmental history, symptoms, functional impairment across settings, medical and mental-health context, collateral information and differential or co-occurring conditions. Autism assessment also relies on developmental and current evidence, clinical judgment and co-occurring needs.

No single screener, cognitive test, ADOS, ADI-R or other named measure is universally required or sufficient on its own. The clinician selects methods that fit the referral question, age, communication profile and available evidence. Scores may help organize questions, but they do not replace assessment.

CADDRA guideline overview Public Health Agency of Canada: autism for professionals

When another pathway may come first

Psychological assessment does not replace urgent care, medical evaluation, psychiatric treatment or profession-specific assessment.

acute suicidality, psychosis, mania, severe substance withdrawal or another urgent safety concern
new neurological signs, delirium, acute cognitive change, untreated sleep disorder or another medical mimic
medication initiation or monitoring when prescribing is the immediate need
a narrowly defined academic-skill question requiring psychoeducational testing
significant adaptive, language, hearing, vision or occupational-function questions requiring interdisciplinary input

What to explain to patients

Assessment is designed to answer a clinical question, not promise a diagnosis. Explain that the process may include interviews, records, questionnaires, developmental or collateral information and other methods selected for that question.

Findings should make supported conclusions, uncertainty, strengths and functional impact clear. External organizations make their own eligibility and accommodation decisions.

Source record

Clinical sources and review

Published and reviewed by BrainLab Psychology Group, September 1, 2026. This resource supports referral quality and is not a diagnostic protocol.

CADDRA Canadian ADHD Practice Guidelines Canada autism signs and assessment Framework for Autism in Canada

Next step

Refer the question, not a predetermined answer.

Describe development, current function, differential considerations, prior care and the decision the assessment should inform.

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