What actually happens in an autism assessment

The shape of the session

Parents often arrive braced for something clinical and conclusive — a test their child either passes or fails. It is not like that, and being told so in advance takes a surprising amount of weight off the day.

In our own experience there was nothing startling about it. The doctor tried to engage our child in dialogue and watched how she responded. The rest of the session was essentially an interview with us.

That matches what the hospitals describe. The clinician observes your child’s behaviour, interviews caregivers to understand development and behaviour, considers information from teachers and other professionals involved, and gives your child toys and activities to play with during the session. It looks, from the outside, a lot like someone playing with your child and chatting to you.

Bring the person who actually knows the days

This is the thing we would most want a parent to read before their appointment, and we have never seen a hospital page mention it.

Because so much of the assessment rests on the adults’ answers, who is in the room changes the quality of the information the doctor gets. And in Singapore, it is not unusual for the person with the closest daily knowledge of a child to be a domestic helper or a grandparent rather than a parent — the one who handles every meal, every nap, every meltdown, every walk to the playground.

If bringing them is not possible, the next best thing is to sit down with them beforehand and go through the sort of questions below, so you can answer with their observations rather than your best guess.

What you will be asked about

Expect detail, and expect to be asked about things you have never consciously catalogued. Broadly, the questions circle around:

• Early development — when your child sat, walked, babbled, said first words; whether anything was gained and then lost.
• Communication — how they let you know what they want, whether they respond to their name, whether they point at things to show you rather than only to get them.
• Play and other children — what they do with toys, and whether they play with other children, alongside them, or apart from them.
• Routine and change — what happens when plans shift or something is out of place.
• Sensory life — sounds, textures, foods, lights, clothing; what they seek out and what they cannot tolerate.
• How they are elsewhere — at preschool, at a grandparent’s, in a restaurant. This is where teacher input earns its place.

Bring your notes, and bring short phone videos of ordinary moments if you have them. Nobody expects you to have memorised your child’s second year, and “I am not sure, but our helper would know” is a perfectly good answer — better than a confident guess.

How long it takes

NUH describes a typical autism assessment as three to four hours in total, conducted over about three sessions. Where standardised tools are used, the two most common are the Autism Diagnostic Interview-Revised, which takes two to three hours, and the Autism Diagnostic Observation Schedule, which takes forty minutes to an hour.

Some children need more time or more sessions, and KKH is explicit that the timing, the number of sessions and the charges involved will be discussed with you. Our own assessment ran across two sessions, with a review about a year later.

If your child “behaves well” on the day

A worry worth naming, because it troubles a lot of parents: what if the assessment catches a good hour and misses everything you have been describing?

This is precisely why the assessment is not just an observation. The developmental history you give, and the input from teachers and other professionals, exist to cover exactly this gap. An unusually smooth session does not erase months of your evidence — and it is another reason to bring the person who sees the unfiltered version.

When and how you get the results

Results are usually shared with you verbally, either at the end of the session or at a separate follow-up appointment. The written report usually arrives four to six weeks after the session.

Plan for that gap. It is a strange stretch of time — you may know the answer while still holding no document. If you need the report for a programme application or a school, ask at the appointment when to expect it and whether anything can proceed in the meantime.

One thing worth knowing before you leave: you may not need the report to start. A formal autism diagnosis is not required to begin early intervention — a paediatrician assessing your child as at risk of a developmental delay can recommend it to SG Enable. Ask about it while you are still in the room.

And whatever comes next, the first weeks afterwards are their own thing entirely. You do not have to have a plan by the time you reach the car park.