ADHD Assessments in Children: What's Involved and Why Psychologists Often Wait Until School

If you suspect your child has ADHD, you may have noticed many psychologists won't assess a young child, or recommend waiting until school. Here's what's involved in a child ADHD assessment, why we typically wait, and what to do in the meantime.

If you suspect your child may have ADHD, you have probably already done a lot of watching, reading, and wondering. You may have noticed patterns that worry you, or you may have been told by a teacher or family member that something seems off. The next step, an ADHD assessment, sounds straightforward until you ask about it and discover that many psychologists will not assess a young child, or will recommend waiting until your child has been in school for a year or more.

This can feel frustrating, particularly when you are watching your child struggle. This post explains what an ADHD assessment for children actually involves, why psychologists typically wait until a child has started school, and what to do if you suspect ADHD but are being told to wait.

What ADHD actually is

ADHD (attention deficit hyperactivity disorder) is a neurodevelopmental condition affecting attention, impulse control, and executive function. It is not a behavioural problem caused by parenting, screen time, or sugar, although all of those things can affect how ADHD shows up day to day.

ADHD presents in three main ways, sometimes called presentations or subtypes. Predominantly inattentive presentation involves difficulty sustaining attention, organising tasks, following through, and managing time. Predominantly hyperactive-impulsive presentation involves restlessness, fidgeting, talking a lot, interrupting, and acting on impulse. Combined presentation involves features of both.

Under the DSM-5, an ADHD diagnosis requires that symptoms were present before age 12, that they appear in more than one setting (typically home and school), that they have lasted at least six months, and that they cause meaningful interference with daily life.

Why psychologists often wait until a child has started school

This is the question most parents have, and the answer is genuinely clinical rather than bureaucratic. The Royal Children's Hospital Melbourne and most Australian paediatric guidance recommend that children are usually at least about five years old before an ADHD assessment, with school attendance as a key part of the picture. There are several reasons.

Young children are developmentally very active and inattentive by design. A three or four year old who cannot sit still for fifteen minutes, who interrupts adults constantly, who jumps from activity to activity, and who shouts when frustrated is doing what three and four year olds do. The cluster of behaviours that look like ADHD in a five year old is, in a three year old, simply early childhood. Without a way to distinguish typical development from a clinical condition, you risk diagnosing something that is not there or missing something that is.

ADHD requires evidence of impact across multiple settings. The DSM-5 criteria require that the symptoms are present in more than one setting. For most young children, life happens primarily at home, with limited time in structured group environments. Once a child starts school, there is a second consistent setting (with consistent observers, namely teachers) where the behaviours can be observed and reported on. Without that second setting, the diagnostic picture is incomplete.

School provides the developmental test that home cannot. School demands sustained attention to non-preferred tasks, sitting still in group settings, following multi-step instructions, transitioning between activities, and managing impulses around peers and authority figures. These are precisely the demands that ADHD makes difficult. Home, even a structured home, rarely tests these capacities in the same way. A child who looks busy and impulsive at home but settles into school routines after a few months is probably not showing ADHD. A child whose difficulties persist or worsen at school is showing the diagnostic pattern.

Teacher reports are central to the assessment. A core part of the assessment is structured information from teachers who have spent hundreds of hours observing your child in a comparison group of similar-aged peers. Without that data source, the assessment is missing one of its most reliable inputs.

A child who has not yet started school can sometimes be assessed earlier if there are specific clinical reasons, such as significant developmental concerns, safety risks, or extreme functional impact. But for most children, waiting until they have been in school for at least six to twelve months produces a more accurate diagnosis and a more useful set of recommendations.

What an ADHD assessment in children actually involves

A psychological assessment for ADHD in children is multi-source by design. The DSM-5 criteria explicitly require information from more than one setting, so no single conversation, test, or rating scale can produce a diagnosis on its own. A thorough assessment usually includes the following.

Parent interview. The psychologist meets with the parents or carers to gather a detailed developmental, medical, educational, and family history. This includes when the difficulties were first noticed, what they look like across different situations, what has been tried, the family history of attention or learning difficulties, and the broader picture of the child's life. This usually takes between one and two hours.

Child interview and observation. The psychologist meets with the child, with the form of the session adjusted to the child's age. For younger children, this is often observational and play-based rather than formally interview-based. For older children and adolescents, the conversation can be more direct. The psychologist is watching for attention, regulation, social engagement, and other clinically relevant features.

Behavioural rating scales. Standardised rating scales completed by parents and teachers are central to ADHD assessment. Common tools include the Conners-3, the BASC-3, the SDQ, and the Vanderbilt scales. These provide structured information about the frequency and severity of attention and behavioural symptoms across home and school. Parents and teachers complete their own versions independently, which is what allows the cross-setting comparison the DSM-5 criteria require.

Teacher input. Beyond rating scales, the psychologist may seek qualitative input from the child's teacher about classroom functioning, learning, peer relationships, and how the child compares with same-age peers. This is often where the most useful diagnostic information comes from.

Cognitive testing where indicated. Cognitive testing (such as the WISC-V for school-aged children) is often included in ADHD assessments, though not always required for the diagnosis itself. It is most useful when there are questions about learning, when the child has been struggling academically, or when ruling out alternative explanations such as a specific learning disorder or intellectual differences. Cognitive testing also identifies patterns in working memory, processing speed, and other cognitive functions that often co-occur with ADHD and that shape what kind of support will help.

Screening for co-occurring conditions. ADHD frequently co-occurs with anxiety, learning disorders, autism, and other conditions. A good assessment screens for these and either identifies them, rules them out, or recommends further assessment where indicated. This matters because the supports for ADHD alone are different from the supports for ADHD plus anxiety or ADHD plus a learning disorder.

Scoring, integration, and report. The psychologist analyses the information from all sources, considers it against the DSM-5 criteria, and writes a detailed report. The report typically includes the assessment findings, whether diagnostic criteria are met, the specific presentation if so, the implications for the child's learning and daily life, and recommendations for home, school, and any further referrals.

Feedback session. The psychologist meets with the parents to walk through the findings, explain what the diagnosis does and does not mean, and talk through the recommendations in detail, including practical strategies for home and school and any further referrals, so you leave with a clear plan rather than just a result. For older children, the feedback can be shared with them at a developmentally appropriate level.

The end-to-end process typically takes between four and eight weeks from first appointment to written report, depending on the responsiveness of the school in providing information and the complexity of the picture.

A note on medication

Psychologists in Australia can assess for ADHD but cannot prescribe medication. If medication is being considered as part of the treatment, the prescribing pathway involves a paediatrician (for children) or a psychiatrist. A psychologist's assessment report can be shared with a paediatrician or psychiatrist to inform their prescribing decision, and many families find that having the psychological assessment in hand makes the medical consultation more focused and productive.

Medication is one part of ADHD support, not the whole picture. Even where medication is helpful, the broader picture includes school adjustments, parent strategies, skill-building, and sometimes therapy for co-occurring anxiety or self-esteem difficulties. A good assessment report addresses all of these.

At Ivy Psychology

At Ivy Psychology, our psychologists assess ADHD in children, adolescents, and adults, using the multi-source process described above. We work closely with families, schools, and (where relevant) paediatricians to ensure the assessment results translate into meaningful support rather than sitting in a drawer.

If you have questions about whether an assessment is the right next step for your child, including whether your child is at the right developmental stage, you are welcome to get in touch. We can talk through your concerns and help you work out what is likely to be useful.

What to do if you suspect ADHD but are being told to wait

If your child is showing concerning patterns but is too young for formal assessment, there is still useful work to be done.

Document what you are seeing, with dates and specific examples. This information becomes valuable when the assessment does happen, and it helps the psychologist understand the developmental trajectory rather than just the current snapshot.

Talk to your GP and ask for a developmental review. Your GP can rule out other contributors (hearing, vision, sleep, anaemia, thyroid) that can present similarly to ADHD, refer to a paediatrician where appropriate, and help with general guidance.

If your child is in early childhood education, talk to the educators about what they are seeing. Early childhood educators often have a good developmental sense of what is and is not typical for the child's age.

Focus on the foundations that help every child. Predictable routines, good sleep, plenty of physical activity, attuned attention, clear and brief expectations, and connection-based parenting all support attention and regulation in young children, whether or not ADHD is eventually diagnosed.

If significant safety, developmental, or functional concerns are present, ask your paediatrician whether earlier assessment is warranted in your child's specific case. The general guidance to wait until school is exactly that, guidance, and there are children for whom earlier assessment is clinically indicated.

If you would like to talk through your concerns and what kind of next step makes sense, you are welcome to get in touch.