Autism Assessment Across the Lifespan: Diagnosis, Clinical Challenges, and Measuring Change

This masterclass is aimed at clinicians working with children and adolescents with autism, including psychologists, psychiatrists, psychotherapists, family therapists, mental health practitioners, and multidisciplinary professionals looking to strengthen their practical understanding of autism diagnosis and assessment.

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Designed with a strong focus on practical application, the session will explore how autism presents differently across children, adolescents, and adults, highlighting how referral reasons, developmental stage, and environmental factors shape assessment outcomes.

Participants will gain critical insight into best practice for measuring strengths and difficulties in autism, moving beyond a purely deficit-based model toward a more holistic, person-centred approach. The masterclass will also address some of the most pressing challenges in contemporary clinical practice, including differentiating autism from co-occurring conditions, navigating diagnostic uncertainty, and conducting meaningful assessments in diverse populations.

A key component of this session is the exploration of measuring change in autism over time, an area of growing importance for both clinical care and research. Attendees will learn how to evaluate developmental trajectories, monitor intervention outcomes, and use assessment tools to support long-term planning and personalised care.

Tailored for psychologists, psychiatrists, psychotherapists, family therapists, and multidisciplinary mental health professionals, this training offers a valuable opportunity to strengthen skills in autism diagnostic assessment, enhance confidence in complex cases, and stay up to date with the latest research and clinical frameworks.

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1. How does autism present differently across childhood, adolescence, and adulthood?

Autism is a lifelong condition, but how it shows up changes with age. In young children, assessment often focuses on developmental progress and family needs; in adolescents and adults, social functioning, adaptive skills, and mental health become more central. Reasons for referral, developmental stage, and environment all shape what an assessment looks like and what it should prioritise.

2. What does a thorough autism diagnostic assessment involve?

A good autism assessment goes beyond confirming or ruling out a diagnosis. It builds a detailed picture of an individual’s strengths and difficulties, considers co-occurring conditions, and takes account of developmental stage and context. A multidisciplinary approach, drawing on observation, history, and standardised tools, helps ensure the assessment is comprehensive and tailored to the person.

3. How do clinicians differentiate autism from co-occurring conditions?

One of the hardest parts of autism assessment is distinguishing it from — or identifying it alongside — conditions such as anxiety, ADHD, or developmental and communication difficulties. These often overlap, and features can look similar. Careful assessment of developmental history, the pattern and context of difficulties, and how traits present over time helps clinicians navigate diagnostic uncertainty.

4. Why is autism often missed or diagnosed late in girls and women?

Autism has historically been better recognised in boys, and many assessment tools were developed largely with male presentations in mind. Girls and women may mask difficulties, present differently socially, or be identified as having anxiety or depression instead. Awareness of these patterns, and of possible bias in standard measures, helps clinicians assess girls and women more accurately.

5. Why is measuring change in autism over time important?

Autism traits are not fixed, and can shift with development, environment, and support. Tracking change over time helps clinicians evaluate developmental trajectories, monitor whether interventions are working, and plan for the longer term. This is an area of growing importance, supporting more personalised care and clearer decisions about what support an individual needs and when.

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