Skip to content
Micah sammie chaffin Zdf3zn5 X Xt U unsplash

Autism Spectrum Condition (ASC) Assessments

We offer assessments to children, young people and adults

Getting assessed for ASC can be daunting. But it doesn't have to be.

Getting assessed for Autism Spectrum Condition (ASC) can feel like a big step, but our role is to make the process comfortable, transparent and supportive. An assessment isn’t about labels; it’s about understanding yourself better and finding the right support to help you move forward with confidence.

We provide a calm, safe and reassuring environment where you can take things at your own pace. Our team listens carefully, values your perspective, and tailors the process to your unique needs — so you leave with clarity, understanding and the support you need to thrive.

Find out more about the ASC assessment process:

Thorough, evidence-based assessments. Delivered by caring practitioners.

The tools used in the assessment are evidence-based. The assessment process is in keeping with the The National Institute for Health and Care Excellence (NICE) guidelines.

Typically, this involves gathering background information, clinical interview (using Autism diagnostic interview [ADIr] where appropriate), questionnaire data, information from other sources (school, university) and Autism Diagnostic Observation Schedule (ADOS). The assessment varies depending on the age of the individual being assessed and their personal circumstances.

The assessment is carried out by clinicians accredited in the administration and interpretation of the assessment tools used. ASC is diagnosed in accordance with DSM V and ICD 11 criteria.

Enquire now

"I have only positive things to say about London & Sussex Autism Assessments. From the initial contact to the assessments and diagnosis, everything was seamless. They were sensitive, kind, thorough in their explanations, and incredibly supportive from the very beginning. I will never forget Andrew and the team, as they truly changed my life. They gave me the skills and confidence to face the next chapter with strength and optimism. Forever thankful."

Ed, Adult being assessed
  • Logo tpss
  • Logo rcslt

Get in touch

ASC Assessment Process

Children & Young People

1. Completion of screening questionnaires.

2. Information gathered directly from your child’s educational placement (nursery/ school/ college/ university).

3. Specialist multi-disciplinary assessment using the Autism Diagnostic Observation Schedule-2 (ADOS-2). This is an activity based standardised assessment designed to probe for differences in social interaction, communication, behaviours and imagination. There are different modules that we use depending on the age of the person being assessed.

4. Specialist multi-disciplinary assessment using the Autism Diagnostic Interview-Revised (ADIr). This is a detailed parental interview which focuses on behaviours seen in young people with ASC and a general developmental assessment. This is completed in person at Sussex Autism Assessments (please note, steps 3 and 4 can take place in a different order, depending on appointment availability).

5. Your child's behaviours and presentations will be discussed within our multidisciplinary team and assessed against the Diagnostic and Statistical Manual of Mental Disorders 5th edition (DSM-V) and the International Classification of Diseases 11th revision (ICD-11) for ASC. This is usually completed online.

6. A feedback session where we go through the results of the assessment and consider what future support would be helpful.

A detailed report is provided at the conclusion of the assessment, with recommendations which is yours to share with whomever you feel appropriate.

ASC Assessment Process

For Adults

1. Completion of screening questionnaires.

2. Information gathered from someone who knows the adult well (e.g. partner, sibling, parent, close friend). This usually involves them completing questionnaires but can also involve an interview.

3. Specialist multi-disciplinary assessment using the Autism Diagnostic Observation Schedule-2 (ADOS-2). This is an activity based standardised assessment designed to probe for differences in social interaction, communication, behaviours and imagination. This is completed in person at Sussex Autism Assessments.

4. Specialist multi-disciplinary clinical interview which is based on the Autism Diagnostic Interview-Revised (ADIr). With adults where they are able and consenting to their parents' involvement we will complete the ADIr with them. (This is a detailed parental interview which focuses on behaviours seen in young people with ASC and a general developmental assessment). This is usually completed online (please note, steps 3 and 4 can take place in a different order, depending on appointment availability).

5. The adults' behaviours and presentations will be discussed within our multidisciplinary team and assessed against the Diagnostic and Statistical Manual of Mental Disorders 5th edition (DSM-V) and the International Classification of Diseases 11th revision (ICD-11) for ASC.

6. A feedback session where we go through the results of the assessment and consider what future support would be helpful.

A detailed report is provided at the conclusion of the assessment, with recommendations which is yours to share with whomever you feel appropriate.