What Is the Difference Between an Autism Screening Test and a Diagnosis?

This guide explains the difference between an autism screening test and a formal diagnosis, how accurate online tests are, and what to do with your result.

An autism screening test is a short set of questions about common autistic traits. You might find one online, through an app, or be given one by your GP.

For adults, many screening tests are based on the AQ-10, a 10-question version of the Autism Spectrum Quotient. It asks how much you agree with statements about things like:

• noticing small details others might miss
• finding it hard to tell what others are thinking or feeling
• preferring routines, or finding change difficult
• finding social situations easy or hard

Longer self-assessment tests, such as the RAADS-R, are also widely available online. For children, screening questionnaires are usually completed by a parent or teacher, rather than the child.

Screening tests are designed to be quick and easy. Their job is to flag people who might be autistic, so they can be looked at more closely. They aren't designed to give a final answer.

A diagnosis is a clinical decision made by trained professionals, following NICE guidelines and internationally recognised criteria (DSM-5 or ICD-11).

A diagnostic assessment usually includes:

• questionnaires about autistic traits, masking and wellbeing
• a developmental history, often using a structured interview such as the ADI-R, with a parent or an informant who knew you as a child
• an observation, such as an ADOS-informed session
• information from school, for children
• a multidisciplinary team review, where professionals discuss everything together
• careful consideration of other explanations, or conditions that can occur alongside autism

At the end, you receive a written report explaining the outcome and how it was reached.

Screening asks "Could this be autism?" A diagnosis asks "Is this autism, and what else might be going on?"

Screening takes minutes. A diagnostic assessment takes several appointments, plus questionnaires beforehand.

Screening looks at the present. A diagnosis also looks back at early childhood, because autistic traits need to have been present from early development.

Screening relies on one point of view. A diagnosis brings together several perspectives, such as parents, teachers or family members, as well as observation by a clinician.

Screening can't rule out other causes. A diagnosis considers whether anxiety, ADHD, trauma, a language difficulty or other conditions might better explain things, or be present alongside autism.

Only a diagnosis is formally recognised. A screening result can't be used to access formal support at school, college or work in the same way as a diagnosis.

Some online tests are based on well-researched tools, like the AQ-10. Others are less reliable, especially quick quizzes on social media, or sites that aren't run by health professionals.

Even good screening tools have limits:

• masking can lower scores. Many autistic people, especially women and girls, have learned to hide their traits, and may score lower than expected.
• other things can raise scores. Social anxiety, ADHD, trauma and low mood can all affect answers.
• self-reflection can be hard. Some questions ask how you compare with others, which can be difficult to judge.
• they can't check early childhood. A short questionnaire can't tell whether traits have been there since early development.

So an online autism test can be a useful starting point, but it can't tell you for certain whether you, or your child, are autistic.

A positive result means you've described experiences that are common in autistic people, and that it may be worth looking into further. It doesn't mean you're definitely autistic.

If your result suggests autistic traits, you might find it helpful to:

• reflect on the bigger picture. Have these differences been there since childhood? Do they affect home, work, school or relationships?
• look back at old records. School reports, photos or family memories can be revealing.
• talk to someone who knew you as a child. A parent or older relative may remember things you don't.
• speak to your GP or a specialist provider. They can talk through your options for a full assessment.

Some people feel relieved by a positive result. Others feel unsettled or unsure. Both are completely normal reactions.

A negative result is reassuring for some people, but it isn't the final word, especially if you mask your traits. If you still feel autism might explain your experiences, it's worth talking to a professional.

You don't need a positive screening result to ask for an assessment, and you don't need a diagnosis to ask for understanding and adjustments at work, school or in healthcare.

Raiys works nationwide, offering online autism assessments carried out by an experienced, specialist team. Our assessments follow NICE guidelines, include a multidisciplinary review, and come with a clear, detailed report designed to be shared with your GP, school or employer.

You'll also have access to the Raiys app, where you can securely read your report and use BeChange, our digital support programme. BeChange helps you understand your diagnosis and build practical, everyday strategies at your own pace, with resources across five areas: Mind, Resilience, Life, Move Matters and Nutrition.

If you're in crisis right now, call 999, go to A&E, or call Samaritans free on 116 123, any time of day or night.

Ready to take the next step? Find out more about our autism assessments.

A screening test can open the door, but a full assessment is what gives you a clear answer, and a better understanding of what will help.