How an NHS autism assessment works for adults

Step 1: the GP appointment

The NHS route almost always begins in general practice. You tell the GP that you think you may be autistic and would like to be assessed. The GP listens to your reasons, may ask about your childhood and current difficulties, and decides whether to refer you. Some practices ask you to fill in a questionnaire first, either in the surgery or at home.

The screening questionnaire is a filter, not a verdict. Clinical judgment can override a low score, which matters for adults who have learned to mask. If you think the questionnaire did not capture you, say so and give examples.

Step 2: referral and choosing a service

If the GP agrees, they refer you to the adult autism service your area commissions. Sometimes this sits inside a wider neurodevelopmental or adult mental health service. In England you can ask to be referred to a different provider that holds an NHS contract, using your legal right to choose. In Scotland, Wales and Northern Ireland the referral goes to your health board or trust service.

Step 3: the wait and pre-assessment questionnaires

Once the service accepts the referral, you join its waiting list. Many services send detailed questionnaires while you wait, about your development, daily life and sensory experiences, and some ask a relative to complete one too. Returning these promptly matters, because some services will not book the assessment until the paperwork is back.

Step 4: the assessment itself

NHS adult assessments vary by area, but most share a core structure. You might have one long appointment or several shorter ones, in person or by video. Expect a mix of the following.

• A detailed interview about your current life at home, at work or in study, and in relationships.
• Questions about your early childhood, often with a parent or someone who knew you young.
• A conversation with someone who knows you now, such as a partner or close friend, if you agree.
• Structured observation of how you communicate and interact, sometimes using a standardized tool.
• Questions about mental health, sensory experiences and other conditions such as ADHD.
• A review of documents you provide, such as school reports or workplace assessments.

If nobody is available to describe your childhood, tell the service early. Many teams can work from your own recollections, old school reports or photographs, and missing an informant should not stop an assessment.

Step 5: the outcome and report

Some teams share their conclusion at the end of the final appointment; others write to you afterward. Either way you should receive a written report. It typically says whether you meet criteria for autism, describes your strengths and difficulties, notes any other conditions identified, and suggests support.

Ask for the report in a format that works for you, and do not hesitate to ask questions about anything that seems vague. If you are diagnosed, the NHS says you may be offered a follow-up appointment a few weeks or months later.

If you disagree with the outcome

You can ask the team to explain how they reached their conclusion. If you still disagree, you can ask your GP or the assessment team for a referral to another service for a second opinion, or pay for an independent assessment. Second opinions are easier to argue for when you can point to specific information the first team did not have.

What to bring on the day

A little preparation takes pressure off your memory, which tends to go blank under stress. Bring a folder with your referral letter, any questionnaires you completed, a list of current medications, and short written notes of examples you want to be sure to mention. If you have old school reports, letters from previous clinicians or workplace occupational health notes, bring copies the team can keep.

Asking for adjustments during the process

• Ask for appointment letters and questions in writing.
• Request a video appointment or a quieter room if travel or clinic environments are hard.
• Ask for extra time to answer, or to bring written notes.
• Ask whether a trusted person can come with you.

• Getting an adult autism diagnosis in the UKHow adults get an autism diagnosis in the UK: GP referral, NICE and SIGN guidance, Right to Choose in England, private routes and four-nation differences.
• Right to Choose for an adult autism assessmentHow Right to Choose works for an adult autism assessment in England: who qualifies, how to ask your GP, how to check a provider, and what to do if refused.
• NHS autism assessment waiting lists: what to expect and what to doWhy NHS adult autism waiting lists are long, what the NICE 3-month standard says, how Right to Choose waits compare, and what you can do while you wait.
• How to ask your doctor for an autism referralHow to talk to your GP or primary care doctor about an adult autism assessment: what to say, what to bring, sample wording, and what to do if they say no.
• The AQ-10 adult autism screenerThe AQ-10 explained: the 10-item adult autism screener from Cambridge, what NICE says about it, how it performs in clinics, and where the official form is.