This guide explains how private autism assessments are often structured for adults and for children and young people, what to check in a quote, and how NHS referral and Right to Choose work in England. It is not a screening tool and it does not say whether anyone should seek an assessment.
Adults
NICE guideline CG142 covers autism spectrum disorder in adults. It describes comprehensive assessment as team-based, drawing on a range of professions and skills, and where possible involving an informant who knows the person’s developmental history. The assessment looks at core features across development and current life, other conditions, sensory differences and everyday functioning. NICE also describes brief screening tools such as the AQ-10 as a possible step before offering comprehensive assessment; a screen is not a diagnosis.
Ask who is on the assessing team (for example psychiatrist, psychologist, speech and language therapist), how many sessions you attend, whether an informant interview is included, and how feedback is given.
Children and young people
For under-19s, NICE guideline CG128 covers recognition, referral and diagnosis. It expects autism diagnostic assessment to be carried out by an autism team and to include developmental history, observation of social and communication skills, medical history, consideration of other explanations, and a profile of strengths and needs. NICE says assessment should start within three months of referral to the autism team in the NHS pathway it describes; private clinics set their own timelines. NICE CG128 also says not to rely on any single autism-specific diagnostic tool alone.
Parents and schools are usually asked for detailed information. Ask the clinic how school questionnaires are handled if the school is slow to respond, and whether the fee still covers a full opinion.
Price: no invented figures
We do not yet list verified published prices for autism assessments on this site, so we give no pound figures here. Private fees vary with age group, team composition and whether cognitive testing or speech-and-language assessment is included. Request a written schedule that separates:
- clinical interviews and observation sessions
- informant or school information gathering
- any structured diagnostic instruments
- the report and feedback meeting
- optional extras (workplace or education letters, further psychological testing)
After the report
Ask whether the clinic will share the report with your NHS GP (with consent) and whether they offer any post-diagnostic support sessions. Autism assessments do not lead to a medicine in the way ADHD pathways sometimes do; support is about understanding needs, education or workplace adjustments, and access to local services. Local NHS and council support after a private diagnosis varies. Ask your GP what the local position is.
Questions worth asking
- For adults: how does your pathway map to NICE CG142 (team-based comprehensive assessment, informant input, differential diagnosis)?
- For under-19s: how does your pathway map to NICE CG128 (autism team, developmental history, observation, no single-tool diagnosis)?
- Who writes and signs the report, and what are their registrations?
- Is the assessment accepted by local NHS services and education settings for support planning in your experience, and can you name what you provide to help with that?
- What exact activities are inside the price, and what triggers an extra invoice?
The NHS route and Right to Choose (England)
NHS autism assessment pathways are accessed through a GP or other authorised referrer. Waiting times are a known pressure in many areas; we do not publish a single national autism wait figure on this site because we do not yet have an official local series we trust for that purpose.
Right to Choose in England can apply to a first outpatient appointment with an NHS-commissioned provider, including some independent providers that hold a qualifying NHS contract for autism assessment in the relevant age group. As with ADHD, the referrer must make the referral, providers differ in method and exclusions, and choice does not by itself fix waiting times. ICB public pages stress checking what happens after diagnosis, not only how soon the first appointment is offered.
Discuss options with your GP. Rules and provider lists change, and they differ outside England.
Not medical advice. This guide covers process, cost and how the NHS and private routes are organised. It does not say whether you need a test or treatment. Decisions about your care sit with you and a clinician who knows your history.
Not affiliated with the NHS. The Doctor is an independent publication. It is not part of, or endorsed by, the NHS, the Care Quality Commission or any provider listed. See our full notice.
How we work: methodology. Spotted something wrong? See corrections.
Sources checked for this guide
- NICE CG142, Autism spectrum disorder in adults: diagnosis and management: nice.org.uk/guidance/cg142 (checked 9 November 2026)
- NICE CG128, Autism spectrum disorder in under 19s: recognition, referral and diagnosis: nice.org.uk/guidance/cg128 (checked 9 November 2026)
- NICE CG170, Autism spectrum disorder in under 19s: support and management (use alongside CG128): nice.org.uk/guidance/cg170 (checked 9 November 2026)
- NHS South West London ICB, ADHD and autism Right to Choose explainer: southwestlondon.icb.nhs.uk (checked 9 November 2026)