{"id":1,"date":"2026-08-03T12:27:46","date_gmt":"2026-08-03T12:27:46","guid":{"rendered":"https:\/\/blog.spectrumassessments.co.uk\/?p=1"},"modified":"2026-08-20T14:42:33","modified_gmt":"2026-08-20T14:42:33","slug":"what-happens-during-an-autism-assessment","status":"publish","type":"post","link":"https:\/\/blog.spectrumassessments.co.uk\/?p=1","title":{"rendered":"What Happens During an Autism Assessment? A Step-by-Step Guide"},"content":{"rendered":"\n

Deciding to pursue an autism assessment is a significant step, and it is natural to want to know exactly what to expect before you begin. Understanding the process in advance can make it feel far less daunting. At Spectrum Assessments, our autism assessment<\/a> follows NICE guidance and uses the same structured approach that underpins NHS assessments, which is why a private diagnosis from us is recognised in the same way. In this guide, we walk through what happens at an autism assessment step by step, from your very first enquiry through to receiving your written report, so you know what each stage involves and why it matters.<\/p>\n\n\n\n

Before you begin: your enquiry and free telephone consultation<\/h2>\n\n\n\n

Every assessment starts with a simple enquiry. Once you get in touch, we usually make contact within 24 hours and no later than one week. We then arrange a free telephone consultation. This is a relaxed conversation rather than a formal appointment, and it gives you the chance to ask questions, share some initial background and talk through your reasons for seeking an assessment. It also allows us to check together that an assessment is the right step for you or your child. If you decide to go ahead, we will ask you to read and sign our terms before we book your appointments, so there are no surprises along the way.<\/p>\n\n\n\n

Step one: the developmental history (ADI-R)<\/h2>\n\n\n\n

The first formal part of the assessment is a developmental history, completed using the Autism Diagnostic Interview Revised, known as the ADI-R. This detailed interview takes place online and can last up to three hours. It explores early development, communication and language, social experiences, play and interests, and any sensory differences or particular behaviours. For a child or young person, this session is usually completed with parents or carers rather than the child themselves. For adults, we adapt the approach. Where someone who knew you in childhood is available, they are welcome to contribute, and where they are not, we gather this history through your own account of your life and experiences.<\/p>\n\n\n\n

Step two: the observation assessment (ADOS-2)<\/h2>\n\n\n\n

The next stage is a direct observation using the Autism Diagnostic Observation Schedule, Second Edition, or ADOS-2. This takes place at our clinic in Bristol. The ADOS-2 is a semi-structured assessment of communication, social interaction and, where relevant, imaginative use of materials, designed to gently elicit the kinds of behaviours that are relevant to a diagnosis. There are different modules for different ages and language levels, so the assessment is tailored to the person being seen. When someone can reflect on their own experiences, we also ask questions to gather their perspective directly. The ADI-R and the ADOS-2 are both widely regarded as gold standard tools for autism assessment.<\/p>\n\n\n\n

Step three: the multi-disciplinary diagnostic meeting<\/h2>\n\n\n\n

Once the developmental history and observation are complete, our clinicians hold a multi-disciplinary team meeting. Here, all of the information gathered is reviewed together against the diagnostic criteria for autism spectrum disorder set out in the DSM-5. Considering the evidence as a team, rather than relying on a single clinician, is an important part of a robust and fair assessment. It is worth knowing that a diagnosis is not guaranteed. The purpose of the assessment is to reach an accurate conclusion, and sometimes that conclusion is that the criteria for autism are not met. Either way, you will receive a clear explanation of the reasoning behind the outcome.<\/p>\n\n\n\n

Step four: your feedback meeting and written report<\/h2>\n\n\n\n

After the diagnostic meeting, we arrange a feedback meeting to share the outcome with you. This is a chance to talk through the findings, ask any remaining questions and understand what the result means in practice. You then receive a written report that describes the information gathered, the diagnostic outcome and tailored recommendations for support. The report is yours to keep and to share as you wish, whether with your GP, your child’s school, your employer or a university disability service. For many people, this report becomes the foundation for the support and adjustments they go on to arrange.<\/p>\n\n\n\n

Preparing for your assessment<\/h2>\n\n\n\n

There is very little you need to do to prepare, and there are no right or wrong answers in an assessment. It can help to gather any information you already have, such as old school reports, previous health letters or notes about your early development, though none of these is essential. If you are being assessed as an adult, it can be useful to think in advance about examples from different stages of your life, as this helps the clinician build a full picture. Most of all, it helps to come as you are, because the assessment aims to understand you accurately rather than to test you.<\/p>\n\n\n\n

How long does an autism assessment take?<\/h2>\n\n\n\n

The timeline varies from person to person, as it depends on appointment availability and the information needed. Individual appointments can be lengthy, with the developmental history alone lasting up to three hours, but the process is designed to be thorough rather than rushed. One of the main reasons adults and families choose a private assessment is to avoid the long NHS waiting lists that many people now face and to be seen at a time that suits them. If you would like an idea of current timescales, our team can talk you through this during your consultation, and our frequently asked questions<\/a> page answers many common queries.<\/p>\n\n\n\n

What about ADHD and combined assessments?<\/h2>\n\n\n\n

Autism and attention difficulties often overlap, and some people wish to be assessed for both. Our ADHD assessment<\/a> follows a similarly structured process, including questionnaires and a detailed diagnostic interview, and can be carried out alongside an autism assessment where a combined picture would be helpful. If this applies to you, it is something we can talk through during your free consultation.<\/p>\n\n\n\n

Ready to take the next step?<\/h2>\n\n\n\n

Knowing what happens during an autism assessment can make it feel much more manageable. Whether you are seeking an assessment for yourself through our adult autism assessment<\/a> or for your child through our child autism assessment<\/a>, our experienced clinicians<\/a> are here to guide you through every stage. When you are ready, get in touch to book a free consultation<\/a>, and we will talk you through what happens next.<\/p>\n","protected":false},"excerpt":{"rendered":"

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