Autism Assessment for Children: A Step-by-Step Guide for Parents

What happens at each stage of a child autism assessment, how long it takes, how to talk to your child about it, and what to do if they will not engage.

Most parents who book an autism assessment have been watching, comparing and wondering for a while. Sometimes a paediatrician or educator has raised it. Sometimes another parent has gently said something. Sometimes you have recognised the patterns in your child because you recognise them in yourself.

Whatever brought you here, the process itself is often the unknown part. This is a step-by-step account of what a child autism assessment involves with us, in the order it happens.

Step 1: The intake conversation

A 30 to 60 minute conversation with you, before you commit to anything. We ask what you are noticing, when it started, what school or preschool has said, and what you are hoping the assessment will give you.

By the end we will recommend a scope, whether that is an autism assessment, an ADHD assessment, or a combined assessment. Combined is often the right answer, because the two co-occur frequently and running them sequentially can mean paying for two full processes where one would have done.

If NDIS access is one of your goals, say so at this stage. It changes how we structure the assessment and the report.

Step 2: The parent interview

One to two hours with you, without your child present. This covers developmental history from pregnancy and early milestones onwards, current functioning at home and at school, social communication, sensory experience, and behavioural patterns.

It is detailed, and it is the single most useful hour of the assessment. Things worth bringing:

• Any previous reports: paediatrician, speech pathology, occupational therapy, hearing tests
• School or preschool reports, and any written feedback from teachers
• Baby books or milestone records if you have them, though most parents do not
• Video on your phone of the behaviour that concerns you, if it is hard to describe

Step 3: Sessions with your child

Two to four hours in total, usually across more than one appointment. What happens in the room depends on your child's age and how they present, but it generally includes:

• Observational assessment using validated tools; the ADOS-2 is part of how autism is diagnosed in children
• Interaction-based assessment adapted to your child's age and communication
• Cognitive testing where it is useful for the formulation
• Unstructured observation, which is often where the most informative moments happen

To your child this mostly looks like activities, puzzles, toys and conversation with an adult who is interested in them. It is not an exam and there is nothing to prepare.

Step 4: Teacher and school input

With your consent we gather input from school or preschool, by questionnaire or a brief phone conversation. Children present differently across settings, and a classroom is a social and sensory environment we cannot replicate in a clinic room.

Step 5: The feedback session

A dedicated appointment where we walk you through what we found, before the report is written. You get the diagnostic conclusion, the reasoning, and what it means practically for school, home and any support you are considering.

For older children and adolescents, this session often includes the young person, in language matched to them. We will talk with you beforehand about how much they are told and how.

Step 6: The report

The written report arrives within four to six weeks of your child's final session. It is written to be used by your child's school for accommodations, by the NDIA if you are seeking access, by other clinicians, and by you.

Overall, expect eight to twelve weeks from your intake call to the report. Sessions themselves usually span two to four weeks, and current booking availability for autism assessment is three to four weeks from enquiry.

How to talk to your child about it

We follow your lead, and you know your child best. As a general guide, with younger children we frame the sessions concretely and neutrally, as meeting someone who is going to help us understand how your brain works. With older children and adolescents we usually recommend being direct about what is being assessed and why, because their engagement is part of what makes the assessment work and they tend to respect being told the truth.

If you are unsure what to say, raise it at intake and we will work through the wording with you.

What if your child will not engage

This comes up regularly and we are used to it. Some children refuse to come into the room, some shut down, some manage fifteen minutes of testing at a time.

We adapt with breaks, shorter sessions, a parent in the room, special interests as a way in, and observational assessment where direct testing is not possible. We very rarely abandon an assessment, and we will talk through any adjustments with you before each session.

Two questions parents ask most

My child is verbal, has friends and does well at school. Can they still be autistic?

Yes. The stereotype of the non-speaking, socially isolated child is one presentation among many. Plenty of autistic children are verbally fluent, have close friendships, often with one or two preferred peers, and do well academically, while still experiencing sensory differences, social fatigue, intense interests, strong routines, and a sense of difference they cannot quite name. We assess what is actually there.

Will the report get us NDIS access?

A diagnosis on its own does not grant access. The NDIA requires evidence of functional impact, meaning how the condition affects your child's communication, social participation, learning, self-care and family life. If access is your goal, tell us at intake so we include the functional assessment components and write the report against the access criteria. We cannot guarantee an outcome, because that is the NDIA's decision, but we can give you a properly evidenced report.

Related reading

• What to Expect from an Autism Assessment
• Medicare and Autism Assessment: The Complex Neurodevelopmental Conditions Items Explained
• AuDHD Explained: What It Means When ADHD and Autism Co-Occur

In summary

Intake call, parent interview, two to four hours with your child, school input, feedback session, report. Eight to twelve weeks in total, with booking currently three to four weeks out. The assessment is designed to tell you how your child experiences the world and what would help, not to sort them into a category.