How to get an autism diagnosis in the UK as an adult

Should you seek a diagnosis?

Many autistic adults wonder whether a formal diagnosis is worth pursuing — particularly if they're already managing well, or if they've found their own understanding through community and self-identification. There's no single right answer, but a formal diagnosis can provide:

• Access to post-diagnostic support services
• Legal protection under the Equality Act 2010 (for workplace adjustments)
• Eligibility for disability benefits if your autism significantly affects daily living
• A medically recognised basis for requesting adjustments in higher education
• Validation of your experiences — which for many people is itself transformative

You do not need a formal diagnosis to identify as autistic, to access community support, or to understand yourself better.

Step 1 — Start with a screening assessment

Before approaching your GP, taking a structured autism screening assessment gives you something concrete to bring to the conversation. Our free screening quiz includes sections on social communication and sensory experience, and produces a results page you can save or print.

Step 2 — Preparing your GP appointment

Autism assessments require a GP referral in most cases. Going prepared significantly increases the chance of a referral being made:

• Bring your screening results
• Describe specific difficulties — not "I find socialising hard" but "I have no close friends because I don't understand how to maintain friendships, and every social interaction leaves me exhausted for days"
• Mention childhood traits — autism is present from birth, even if unrecognised. School reports, sensory memories, or accounts from parents/siblings are helpful
• Describe the impact — how autism traits affect your work, relationships, and daily life. GPs are more likely to refer when impairment is clearly described

Step 3 — The NHS pathway

NHS adult autism assessments are managed differently from ADHD. There is no equivalent of the Right to Choose scheme for autism in most areas — assessments are typically managed by local Integrated Care Boards (ICBs) or community mental health teams.

Waiting times vary significantly — some areas manage assessments within a year, others have waits of three years or more. Ask your GP what the current waiting time is in your area so you can plan accordingly.

Step 4 — Private autism assessment

Private autism assessments for adults typically cost £800–2,500 and can usually be accessed within weeks rather than years. They are conducted by clinical psychologists, psychiatrists, or specialist diagnostic teams.

A quality private assessment will include:

• A detailed developmental history interview (1–2 hours)
• Structured observation and clinical assessment
• Completion of standardised questionnaires
• A collateral account from someone who knew you as a child (usually required)
• A written diagnostic report

The National Autistic Society maintains a directory of diagnostic services at autism.org.uk. Always check that the assessor is a registered clinical psychologist or psychiatrist with relevant autism training.

What an autism assessment involves

A formal autism assessment typically takes several hours across one or more appointments. It usually includes:

1. Developmental history — a detailed interview about your childhood, including early development, schooling, social relationships, and any previous diagnoses
2. Current presentation — discussion of how autistic traits manifest in your current daily life
3. Standardised tools — structured clinical assessments and questionnaires completed in advance or during the appointment
4. Collateral information — most assessors require a questionnaire completed by a parent, sibling, or someone who knew you well as a child. If this is not possible (e.g. if parents are deceased), discuss this with the assessor in advance

After your assessment

Whether or not autism is diagnosed, you will receive a written report summarising the assessment findings. If autism is diagnosed:

• Your GP is informed and the diagnosis is added to your medical records
• You may be referred to post-diagnostic support — though availability varies widely by area
• You can access the National Autistic Society's post-diagnostic resources at autism.org.uk
• You can register a disability with your employer if you choose to, and request reasonable adjustments under the Equality Act

What if I don't receive a diagnosis?

If you go through a full assessment and don't receive an autism diagnosis, the assessor should explain clearly why criteria were not met and what they did find. If you feel the assessment was inadequate (e.g. it was too short, the assessor seemed unfamiliar with how autism presents in women, or the collateral information wasn't properly considered), you have the right to request a second opinion.

Many autistic women in particular have experienced assessments that failed to account for masking. If you feel this applies to you, seek an assessor with specific experience in assessing autistic women.