What Happens During an Autism Assessment? A Step-by-Step Guide for Parents

Deciding to seek an autism assessment for your child is a significant step, and once that decision is made, many parents find themselves with a new set of questions. What will the assessment actually involve? How long will it take? Will my child find it distressing? And what happens when it is over?

Understanding the process before it begins can reduce anxiety and help families feel prepared. This article provides a step-by-step overview of what a comprehensive autism assessment typically involves, drawing on clinical practice in child and developmental psychology. The information is general in nature and may vary depending on the clinician and setting.

Before the assessment: preparing and gathering information

Initial consultation

Most assessments begin with an initial consultation or phone intake. This is an opportunity for parents to share their concerns, ask questions about the process, and determine whether a comprehensive assessment is the appropriate next step for their child.

Background questionnaires

Before the assessment appointments, parents are typically asked to complete detailed questionnaires about their child’s development, communication, behaviour, sensory responses, and social functioning. These questionnaires provide important background information and help the psychologist understand the concerns being raised ahead of time.

Teachers or other educators are usually asked to complete their own questionnaires about the child’s functioning in the school environment. School observations are valuable because autism-related difficulties often become more evident in social and group settings where demands are higher.

What to tell your child

Many parents wonder how to explain the upcoming assessment to their child. In general, simple and honest explanations work best. Letting a child know they will be doing some activities with a psychologist who helps children understand how they think, learn, and feel is often sufficient. Older children may have more questions and can usually benefit from a fuller explanation that respects their capacity to understand.

During the assessment

Clinical observation and interaction

A core part of any autism assessment is direct observation of how the child communicates, plays, and interacts. Psychologists are trained to observe and document specific patterns in social engagement, communication style, flexibility, play skills, and sensory responses, across both structured and semi-structured activities. For younger children, this may look like play. For older children and adolescents, it may involve conversation, collaborative tasks, or problem-solving activities.

Standardised assessment tools

Comprehensive autism assessments typically incorporate gold-standard tools alongside clinical observation. The ADOS-2 (Autism Diagnostic Observation Schedule, Second Edition) is a structured observational tool widely used in autism assessment. It involves a series of activities and prompts designed to elicit social communication and interaction in a naturalistic way. Parent interviews, such as the ADI-R (Autism Diagnostic Interview Revised) provide a detailed developmental history and allow clinicians to gather specific information about early development, communication milestones, and behaviour patterns across settings.

Cognitive assessment

Many autism assessments include a cognitive assessment to understand the child’s intellectual profile and identify any co-occurring learning difficulties. This helps ensure that support recommendations are tailored to the child’s full picture, not just the autism diagnosis in isolation.

How children usually experience the assessment

Most children manage the assessment experience well. Psychologists who work with children are experienced at adjusting their pace, style, and approach to meet each child’s needs, and breaks are provided as needed. Some children, particularly those who are anxious about new situations or unfamiliar adults, may find the initial sessions more challenging, and this is anticipated and factored into how the assessment is conducted.

After the assessment: understanding the results

Integrating findings

The psychologist reviews and integrates all of the information gathered, including questionnaires, teacher reports, clinical observations, standardised assessment results, and developmental history. This process involves applying clinical judgement to determine whether the overall picture meets diagnostic criteria for autism spectrum disorder, and whether another explanation better accounts for any part of the child’s profile.

The written report

Families receive a detailed written report summarising the assessment findings. The report explains the clinical observations, test results, and diagnostic conclusions in clear, accessible language, and outlines the child’s strengths alongside areas of difficulty.

Importantly, the report includes practical recommendations tailored to the child’s specific profile. These may include strategies for home and school, referrals to other professionals such as speech pathologists or occupational therapists, guidance on accessing NDIS support where applicable, and suggestions for psychological support.

Feedback session

A feedback appointment allows the psychologist to walk parents through the findings, explain the diagnosis and its implications, and answer questions. This is a crucial part of the process, and many parents describe the feedback session as one of the most valuable parts of the assessment experience overall.

For older children and adolescents, it is often appropriate to share findings with them directly in an age-appropriate way, as understanding their own profile can be genuinely empowering for young people.

If the assessment does not result in an autism diagnosis

A comprehensive assessment that does not result in an autism diagnosis is not a wasted process. Assessment often identifies other factors that may be contributing to a child’s difficulties, including ADHD, anxiety, language differences, learning disorders, or sensory processing challenges. Understanding these factors is valuable in its own right and can still open the door to meaningful, targeted support.

What comes next?

An autism diagnosis is a starting point, not an endpoint. Following assessment, families are better placed to access appropriate support, advocate for school adjustments, and seek the services their child needs. Many families report that having a diagnosis, and the clarity it brings, makes a significant difference to how they understand and support their child going forward.

Support for your family

The team at Sydney Children’s Practice provides comprehensive autism assessments for children and adolescents in a supportive, family-friendly environment. We work collaboratively with families to understand each child’s unique profile and provide clear, practical recommendations. Families are welcome to get in touch to discuss concerns or explore whether an assessment may be helpful.

The information in this article is general in nature and is not a substitute for individualised assessment or professional advice. If you have concerns about your child, we encourage you to seek guidance from a qualified health professional.

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Bradley Bowen, MPsych (Clinical Psychology), BA (Hons I), BSc, AMusA, MAPS is a Board-registered Clinical Psychologist and Clinic Director of Sydney Children’s Practice. He has worked with children, adolescents, and families for over 25 years and has been practising as a Clinical Psychologist since 2011. Bradley has a particular interest in supporting neurodivergent children, including those with ADHD and Autism, and works using evidence-based approaches such as CBT, ACT, and Mindfulness.