Autism Assessments
Children, Young People And Adults.
Our multidisciplinary autism assessments follow NICE guidelines and NHS operational guidance and are completed by a team of specialist clinicians. We take a neuroaffirming, person-centred approach, focusing on understanding the whole individual and providing meaningful recommendations alongside a comprehensive diagnostic report.
We provide comprehensive autism assessments for children, young people and adults. Our assessments are completed using recognised assessment tools and follow current NICE guidelines, NHS operational guidance and DSM-5 diagnostic criteria.
Autism Assessment Services
Every assessment is completed by a multidisciplinary team of at least three specialist clinicians, ensuring a thorough and holistic understanding of the individual’s strengths, experiences and support needs.
We recognise that pursuing an autism assessment can be a significant step for individuals and families. Our approach is supportive, transparent and person-centred, with the assessment process tailored to the needs of the individual wherever possible.
From your initial enquiry through to feedback and the final written report, we will guide you through each stage of the process, ensuring you understand what to expect and have opportunities to ask questions along the way.
Following assessment, you will receive a detailed report outlining the outcome of the assessment, a profile of strengths and needs, and practical recommendations to support wellbeing, participation and success across everyday life.
Meet The Clinical Team
Each assessment is led by experienced, regulated clinicians who specialise in neurodevelopmental conditions.
Maddisyn English
Clinical Lead — Speech and Language Therapist
Maddi is a speech and language therapist with extensive experience supporting neurodivergent people across childhood and adulthood. She graduated with a Bachelor of Speech Pathology from Southern Cross University, Australia, and has worked in hospitals (Innisfail and Ipswich), Brisbane Catholic Education, and a specialist Autism Spectrum Condition school in the UK before founding Onyx Therapy. She delivers training to families, schools and workplaces on neurodivergence and its impact on day-to-day functioning.
Justine McDonnell
Clinical Lead — Occupational Therapist
Justine is an Occupational Therapist and Co-Director of Onyx Therapy, with extensive experience supporting autistic individuals across mainstream schools, specialist provisions, colleges, EOTAS packages and community settings. Her expertise covers sensory processing, executive functioning, emotional regulation, daily living skills and motor coordination. Justine is committed to creating a safe, non-judgmental assessment process where people are not under pressure to “perform” socially, and where outcomes lead to practical recommendations and improved access to support.
Dr Suzanne Smith
Clinical Psychologist
Suzanne is an HCPC-registered Clinical Psychologist specialising in neurodevelopmental conditions since completing her Doctorate at the University of Birmingham in 2009. She has worked in NHS specialist neurodevelopmental services as a Senior Clinical Psychologist conducting autism and ADHD assessments, autism profiling, post-diagnostic support and consultancy. She is a Sessional Lecturer at Warwick University and is trained in ADOS-2 (Modules 1–4), MIGDAS-2, the QB computerised ADHD screening tool, and the WAIS-IV, WISC-V and WPPSI-IV cognitive assessments.
Testimonials
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Real stories from individuals and families we’ve supported.
Most Popular Questions
Frequently Asked Questions
From the initial appointment to the written report, most assessments complete within 6–10 weeks. We will give you a clear timeline at the start, and we can usually offer initial appointments within 2–3 weeks of enquiry.
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We offer both. Some parts of the assessment work very well online, while ADOS-2 is conducted in person. We will agree the format with you at the start so it fits your needs and preferences.
Yes. Our reports are written to the standard expected by educational settings, the DVLA, Access to Work, mental health services and employers. We are happy to clarify any specific requirements your setting has.
A thorough assessment is valuable either way. Where autism is not identified, we explain why, share a clear formulation of what is going on, and signpost to the support that fits your profile.
Yes. ADHD assessment can be combined with autism assessment where this is clinically appropriate. Please mention this at enquiry so we can plan the pathway with you.
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