ADHD in Children: Signs and Assessment

In children, ADHD typically shows as difficulty sustaining attention, hyperactivity and impulsivity that are beyond what's expected for their age and that affect them across home and school. It's identified through specialist assessment, not a single test.

How ADHD presents in children

Children with ADHD may struggle to sustain attention, be highly active or restless, act impulsively, and find it hard to follow instructions or finish tasks, to a degree that is beyond typical for their developmental stage and that shows up across more than one setting, such as both home and school.

Source: NICE NG87 (symptoms excessive for developmental level, present across settings, causing impairment).

It must affect more than one area of life

Occasional inattention or high energy is normal in childhood. What matters clinically is whether the difficulties are persistent, beyond what is expected for the child's age, and causing real impairment across settings.

Source: NICE NG87.

How it's assessed in children

Assessment involves a specialist building a full picture, typically drawing on information from parents and carers and, where appropriate, school, alongside direct clinical evaluation. As with adults, no questionnaire alone diagnoses ADHD.

Source: NICE NG87.

Quality and safeguards for children's assessments

As demand for children's ADHD assessments has risen, there is concern that pressure to clear waiting lists can lead to variable quality. To address this, UK specialists developed the ADHD Assessment Quality Assurance Standard for Children and Teenagers (CAAQAS), which sets out what a good-quality assessment should involve, beyond the broad requirements of NICE. A key principle, as in adult assessments, is that clinicians who are not independently qualified to diagnose should work within multidisciplinary team support and appropriate supervision. ThinkBetter matches families only with CQC-registered clinics that work to these standards.

Source: Young et al. 2024, ADHD Assessment Quality Assurance Standard for Children and Teenagers, CAAQAS (PMID 39737064).

A note for parents

If you recognise these patterns in your child, a screening can help you decide whether to seek a formal assessment. It isn't a diagnosis; it's a way of deciding whether the next step is worthwhile.