Book a GP appointment and ask to be referred for an adult autism assessment; in England you can use Right to Choose to pick a faster NHS provider. Waits average over a year as of 2026.
The steps, in order
- See your GP. Adults are diagnosed through a specialist NHS autism team, and the usual way in is a GP referral. Say plainly that you think you may be autistic and would like an assessment. It helps to bring a few written examples (social exhaustion, sensory difficulties, lifelong patterns) so the appointment stays on track.
- Ask about Right to Choose (England only). If you are registered with a GP in England, you have a legal right to choose which NHS-funded provider assesses you, and these providers often have shorter waits than the local team. Your GP refers you the same way; the assessment stays free. In Scotland the pathway follows SIGN guidance; Wales and Northern Ireland follow NICE but do not offer Right to Choose.
- Tell your university's disability service. You do not need to wait for a diagnosis to register. Many services run a neurodiversity screening and can write to your GP supporting the referral, and they can put adjustments in place straight away.
How long it takes
NICE says you should be seen within 13 weeks of referral, but that target is rarely met. As of November 2025 around 90% of people waiting had waited longer than 13 weeks, and the average wait was over 16 months. Right to Choose providers in England were quoting roughly 14 to 28 weeks for adult autism assessments in early 2026, though some Integrated Care Boards have capped or paused funding, so check availability before you commit.
If you cannot wait that long
You do not need a diagnosis to get support at university. Under the Equality Act 2010 your university must make reasonable adjustments for a disability, and a strong suspicion plus a screening or referral letter is often enough to start things like extra time, quiet exam rooms or mentoring. A referral can also count as a working diagnosis for some Disabled Students' Allowance (DSA) support while you wait. A private assessment is an option, but check whether your local NHS team will accept it before you pay.
Realising you may be autistic in your late teens or twenties can stir up a lot, and late-diagnosis distress is common. If you feel overwhelmed or unsafe, you do not have to sit with it alone: call Samaritans on 116 123 (any time) or Papyrus HOPELINE247 on 0800 068 4141. In immediate danger, call 999 or go to A&E.
Where the law comes from
- NHS: how to get an autism diagnosis (adults and children)
- National Autistic Society: how to request an autism assessment (England, Scotland, Wales, NI routes; Right to Choose)
- National Autistic Society: autism assessment waiting times (November 2025 data, average wait over 16 months, 90% past the 13-week NICE standard)
- GOV.UK: Disabled Students' Allowance (DSA)
- Equality Act 2010, section 20 (duty to make reasonable adjustments)
Related
This page is general information, not clinical or legal advice.