Autism Assessments
Children, Young People And Adults.
We offer gold-standard autism assessments for all ages, conducted by a multidisciplinary team of at least three specialist clinicians, following NICE guidelines and the NHS operational guidance for autism diagnosis.
Descriptions Service
We are pleased to be able to offer autism assessments for all ages. Assessments are conducted using the gold standard assessments and follow the NICE guidelines and the NHS operational guidance for autism assessments.
Assessments are completed with a multi disciplinary team, with each assessment having at least 3 specialist practitioners as part of the assessment. We use the DSM-5 criteria as our diagnostic criteria.
Our assessment pathway is structured, transparent and paced around the person being assessed. From first enquiry to written report, you will know what is happening at each step.
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.
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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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