What Is the ADOS-2 Autism Assessment and How Does It Work?

This guide explains what the ADOS-2 is, what happens during the session, and what it means when an assessment is "ADOS-informed" because it takes place online.

ADOS stands for Autism Diagnostic Observation Schedule. The ADOS-2 is the current edition, and one of the most widely used autism assessment tools in the UK.

It gives trained clinicians a structured way to observe communication, social interaction, imagination, and repetitive behaviours or intense interests. There are different versions, called modules, for different ages and levels of spoken language. The clinician chooses the one that fits best.

The session usually lasts around 40 to 60 minutes.

• For younger children, it's mostly play-based, such as playing with toys, sharing a book or pretend play. A parent or carer usually stays nearby.
• For older children and teenagers, it's a mix of activities and conversation, such as telling a story from a picture book and chatting about school, friends and feelings.
• For adults, it's mainly a conversation about work, interests, relationships and emotions, with a few short tasks.

Some activities may feel a little unusual. That's expected. They're designed to create natural moments to observe communication and social interaction.

The ADOS-2 was designed to be carried out face to face, using a set of materials in the room. Because Raiys assessments take place online, our clinicians use an ADOS-informed approach.

This means:

• the clinician follows the structure and principles of the ADOS-2, adapting activities so they work well by video
• they observe the same key areas, such as communication, social interaction and repetitive behaviours
• because the standard in-person conditions can't be met online, the formal ADOS-2 scores and cut-offs aren't used
• instead, the clinician records detailed observations, which are weighed alongside everything else in your assessment

This doesn't make the assessment less thorough. No autism diagnosis should rely on an ADOS score alone, and the observation is always one part of a much wider picture.

The clinician brings the observation together with other information, such as:

• a detailed developmental history, often gathered with a parent or someone who knew you as a child
• questionnaires from you, your family or your child's school
• information about daily life, health and any other conditions

In line with NICE guidelines, the final decision uses DSM-5 or ICD-11 criteria, and considers how things have been throughout life, not just during one session.

• There's nothing to prepare. Just come as you are.
• Get comfortable. Choose a quiet space, and have a drink or anything that helps you feel settled.
• Mention masking. If you notice yourself hiding your differences, let the clinician know. Many autistic people do this, especially in new situations.
• Tell us about sensory needs, such as bright screens or background noise.
• Ask questions or take a break whenever you need to.

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

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

The ADOS-2 may sound technical, but it's really a structured way of getting to know you or your child. Knowing what to expect can help the day feel calmer and more manageable.