Diagnosis & Assessment

An adaptive functioning assessment looks at how a child manages everyday life skills such as communication, self-care, getting along with others, staying safe, building independence, and handling practical tasks at home and in the community. Rather than focusing on what a child knows in a testing room, it captures how they actually use skills in real daily situations, often by asking caregivers and teachers structured questions. For autistic children, adaptive functioning information gives a fuller and more meaningful picture of their strengths and support needs.

An assessment report is a detailed written document prepared by a qualified professional after completing a formal evaluation of a child. It brings together background history, the specific tools and methods used during the assessment, key findings, a diagnosis if one applies, and practical recommendations for supports and next steps. Think of it as a thorough snapshot of your child's strengths, support needs, and the professional's clinical reasoning.

An autism assessment is a structured process, usually led by qualified professionals, that gathers information about a child’s development, communication, play, sensory profile, and daily functioning to understand whether autism explains what a family is seeing.

An autism diagnosis is a professional conclusion that a child’s profile meets the criteria for autism spectrum disorder. A diagnosis can help a family access services, but a child’s needs and strengths matter more than any single label.

The Autism Diagnostic Interview-Revised, or ADI-R, is a structured interview that a trained clinician conducts with a parent or caregiver to gather detailed information about a child's developmental history and day-to-day behaviours related to autism. The interview covers areas like early language development, social skills, play, and repetitive or restricted behaviours, and it draws on your knowledge of your child across different stages of their life. Because caregivers are the experts on their own children, the ADI-R treats your observations and memories as a valuable and central part of the assessment process.

The Autism Diagnostic Observation Schedule, Second Edition, or ADOS-2, is a standardized assessment tool used by trained professionals to observe how a child communicates, interacts socially, plays, and whether they show any restricted or repetitive behaviours associated with autism. During the assessment, a clinician guides your child through a series of structured activities and conversations designed to create natural opportunities for observation. The ADOS-2 is considered one of the most widely used tools in autism assessment and is often part of a broader evaluation that includes other measures and caregiver input.

Autism support levels are part of the DSM-5 framework and describe the amount of support a person may benefit from across two main areas: social communication and restricted or repetitive behaviours. There are three levels, ranging from requiring some support to requiring very substantial support, and they are meant to give a general picture of a person's day-to-day support needs at the time of assessment. It is worth knowing that a person's support needs can change over time and across different environments, so these levels reflect a snapshot rather than a permanent label.

A behavioural assessment explores what may be behind a child's actions, moments of distress, communication attempts, or safety-related concerns, looking at the whole child and their environment rather than focusing only on the behaviour itself. A trained professional gathers information from caregivers, teachers, and direct observation to understand patterns and possible contributors such as sensory needs, communication challenges, or unmet support needs. The goal is always to better understand and support the child, not to label or judge them.

A child psychologist is a regulated health professional with specialized graduate-level training in assessing and supporting children's development, learning, emotions, and behaviour. They use a range of standardized tools and observations to evaluate a child's cognitive abilities, adaptive skills, and social-emotional development, and in most Canadian provinces and territories they are authorized to diagnose autism spectrum disorder. Families often work with child psychologists both for diagnostic assessments and for ongoing therapeutic support.

The Childhood Autism Rating Scale, Second Edition, or CARS-2, is a tool that trained professionals may use to help understand autism-related characteristics in a child based on structured observation and information gathered about the child. It looks at a range of behaviours and skills to help clinicians form a fuller picture of a child's profile. The CARS-2 is one of several tools a professional might choose to include as part of a broader autism assessment.

A cognitive assessment looks at a child's thinking and problem-solving abilities, including areas such as reasoning, memory, attention, processing speed, verbal understanding, and visual-spatial skills. Conducted by a psychologist using age-appropriate standardized tools, it helps build a picture of how a child learns and processes information, highlighting both strengths and areas where extra support may help. For autistic children, cognitive assessments are often interpreted alongside other information to give the most accurate and complete understanding of how the child thinks and learns.

A developmental assessment looks at how a child is growing and learning across areas such as communication, movement, play, thinking, social interaction, and daily living skills. A team of professionals — which may include psychologists, speech-language pathologists, occupational therapists, or physicians — gathers information through observation, interviews, and standardized tools. The goal is to get a fuller picture of a child's strengths and support needs, not to label what is wrong.

A developmental paediatrician is a medical doctor who has completed additional specialized training in child development and neurodevelopmental conditions such as autism, ADHD, and developmental delays. They assess children's developmental progress, coordinate with other specialists, and can provide a medical diagnosis of autism in most parts of Canada. Families are often referred to a developmental paediatrician by their family doctor or general paediatrician when developmental differences are first noticed.

A diagnosis letter is a document written and signed by a qualified professional — such as a pediatrician, psychologist, or psychiatrist — that formally confirms a child's diagnosis. It typically includes the child's name, the professional's credentials, the date, and a clear statement of the diagnosis. Families in Canada often need this letter as a starting point for accessing school supports, therapy services, and funding programs.

DSM-5 autism criteria are the clinical guidelines that trained professionals use to determine whether a child or adult meets the diagnostic requirements for autism spectrum disorder. The DSM-5, published by the American Psychiatric Association, outlines specific areas a clinician looks at, including social communication and interaction, as well as restricted or repetitive behaviours or interests. Many Canadian families first encounter these criteria when their child is being assessed by a psychologist, developmental paediatrician, or psychiatrist.

Early signs of autism are developmental differences that may suggest a child would benefit from screening or a more thorough assessment. These can include things like differences in eye contact, responses to their name, how a child plays, communicates, or connects with others — though every child develops in their own way and at their own pace. Noticing these differences early and talking with a healthcare provider can open the door to supports that make a real difference for Canadian families.

A Functional Behaviour Assessment, or FBA, is a structured process that helps a team understand the purpose or function behind a child's behaviour — in other words, what the behaviour is communicating or achieving for the child. By looking at what happens before, during, and after a behaviour, an FBA helps identify patterns such as whether the behaviour helps the child get something they need, avoid something overwhelming, or express something they cannot yet communicate in another way. An FBA is a respectful and evidence-informed tool that puts the child's perspective and needs at the centre.

Functional limitations describe the real, day-to-day ways that a disability or developmental difference affects how a child participates in everyday life — things like communicating with others, managing self-care routines, learning in a classroom, staying safe, regulating emotions, moving around, or taking part in social activities. This language focuses on what support a child actually needs in their daily environment, rather than on a diagnosis label alone. For families of autistic children or children with other neurodevelopmental differences, describing functional limitations clearly can be an important part of accessing the right supports.

A late autism diagnosis happens when autism is identified after early childhood — sometimes when a child reaches school age, in their teen years, or even in adulthood. This can happen for many reasons, including that a child's support needs were less visible in early years, that masking made differences harder to spot, or that earlier access to assessment simply wasn't available. Receiving a diagnosis at any age can be a meaningful and validating step toward understanding yourself or your child.

Medical documentation is a broad term for any professional records, letters, reports, or forms that describe a child's health, development, diagnosis, functional needs, or recommended supports. This can include assessment reports, diagnosis letters, prescription records, therapy progress notes, and forms completed by a doctor or other regulated health professional. Families navigating autism and neurodiversity supports often build a collection of these documents over time, as different services and programs may ask for different pieces.

The Modified Checklist for Autism in Toddlers, often called the M-CHAT, is a short screening questionnaire that a parent or caregiver fills out — usually at a routine well-child visit — to help identify toddlers who may benefit from a more in-depth autism assessment. It asks simple questions about your child's communication, social engagement, and play behaviours, such as whether your child points to show you things or responds to their name. A screen is not a diagnosis; it is simply an early signal that more information might be helpful.

A neuropsychologist is a psychologist with advanced specialized training in understanding how brain development and functioning relate to a child's learning, attention, memory, language, behaviour, and daily life skills. They conduct in-depth assessments that can help identify a detailed picture of a child's individual strengths and challenges, which can be especially helpful for children with complex or co-occurring needs. Families may be referred to a neuropsychologist when a more comprehensive understanding of a child's profile is needed beyond what a standard assessment covers.

An occupational therapy assessment looks at how a child takes part in everyday activities like dressing, eating, play, school tasks, fine motor skills, sensory regulation, sleep routines, and self-care. An occupational therapist (OT) observes the child, speaks with caregivers, and may use standardized tools to understand what is going well and where extra support could help. This kind of assessment is especially helpful for autistic children and children with other developmental differences who find some daily routines challenging.

A psychiatrist is a medical doctor who has completed specialized residency training in mental health, and who can assess, diagnose, and support children and adults experiencing mental health conditions, neurodevelopmental differences, and complex behavioural needs. In the context of autism, a psychiatrist may be involved in diagnosis, in supporting co-occurring conditions such as anxiety or ADHD, or in discussing whether medication might be helpful for a particular concern. Families are typically referred to a psychiatrist through their family doctor, paediatrician, or a children's mental health program.

A psychoeducational assessment explores how a child learns, processes information, solves problems, remembers information, pays attention, and performs academically. It is typically conducted by a registered psychologist or psychological associate and combines standardized testing, observation, and background information from parents and teachers. The results can identify learning disabilities, attention differences, giftedness, or other factors that influence how a child experiences school.

A psychological assessment uses structured interviews, standardized tools, behavioural observation, and detailed history to build a comprehensive picture of a child's development, emotions, behaviour, learning, mental health, and support needs. It is conducted by a registered psychologist and can address a wide range of questions, from understanding anxiety or mood to clarifying a diagnosis such as autism spectrum disorder or ADHD. The report that follows is a detailed, evidence-based document that can guide next steps for families, schools, and service providers.

A qualified professional is someone who is both legally authorized and specifically trained to assess, diagnose, support, or document a child's developmental, medical, or psychological needs within their regulated area of practice. Examples include pediatricians, psychologists, psychiatrists, speech-language pathologists, and occupational therapists, depending on the type of assessment or documentation needed. Each professional can only work within their own regulated scope, so the right professional for a particular task can depend on what kind of assessment or letter is required.

Severe and prolonged impairment is a specific phrase used in certain Canadian government benefit and tax programs — most notably the Disability Tax Credit — to describe when a disability or developmental difference significantly restricts a person's ability to carry out basic daily activities, and when that restriction has lasted or is expected to last for a considerable length of time. The exact meaning of 'severe' and 'prolonged' is defined by each program's own criteria, not by a diagnosis alone. For families of autistic children or children with complex support needs, understanding this language can be an important part of navigating federal and provincial financial supports.

The Social Responsiveness Scale, Second Edition, or SRS-2, is a questionnaire completed by a parent, caregiver, or teacher that gathers information about a child's social communication skills and autism-related traits in everyday settings. It asks about things like how a child responds in social situations, how they communicate, and whether they show restricted or repetitive patterns of behaviour. Because it can be completed by people who know the child well in different settings, it offers a broad and practical view of how a child is doing socially day to day.

A speech-language assessment looks at how a child understands language, uses words or alternative communication tools, communicates socially, produces speech sounds, and takes part in conversation. A speech-language pathologist (SLP) gathers this information through observation, standardized tools, and conversation with caregivers to build a full picture of a child's communication strengths and support needs. For families in Canada, this assessment is often one of the first steps toward connecting a child with speech therapy or appropriate communication supports.

The Vineland Adaptive Behavior Scales are standardized tools used to understand how a child manages everyday tasks and interactions in real life, looking at areas like communication, daily living skills, socialization, and motor development. A clinician gathers this information by interviewing a parent or caregiver, because you see your child across many different settings and situations every day. The results help create a picture of your child's current abilities and where they may benefit from additional learning or support.