ADHD Assessment for Children in the UK: What to expect, what to look for, and what really matters
- Dr Sarah Cunningham
- Mar 2
- 5 min read
At Insight, we support children, young people and families through ADHD assessment and follow-up care.
This article focuses on children and teenagers under 18, although we do also work with adults.
ADHD is being talked about more than ever. With that increased awareness often comes confusion, mixed messages, and uncertainty about what a “good” assessment actually looks like. Media coverage of services that fall short can add to that uncertainty.
If you’re considering an ADHD assessment for your child, this guide is here to help you understand what should be involved, what to be mindful of, and how to prepare.
What is ADHD — and what isn’t it?
ADHD (Attention Deficit Hyperactivity Disorder) is a neurodevelopmental difference that affects attention regulation, impulse control, activity levels and executive functioning.
If you'd like to understand more about what executive functioning is and how it shows up day to day, we've written more about this here
ADHD is not about laziness. It is not about poor parenting. It is not about a child simply “trying harder”.
ADHD can present as:
Predominantly inattentive (difficulty sustaining attention, organisation, follow-through)
Predominantly hyperactive-impulsive (restlessness, impulsivity, difficulty waiting)
Combined presentation (features of both inattention and hyperactive/impulsive behaviours)
These presentations are described in diagnostic frameworks such as the DSM-5.
In many young people, particularly teenagers, hyperactivity can become more subtle over time. A child who was once constantly on the move may instead experience:
Constant foot tapping
Fidgeting with clothing or objects
A sense of inner restlessness
Racing thoughts
Emotional reactivity
Procrastination despite strong intentions
This is where careful assessment matters.
ADHD rarely exists in isolation
ADHD often overlaps with, or co-occurs alongside, other differences.
These can include:
Autism
Anxiety
Trauma-related difficulties
Dyslexia and other learning differences
Sleep difficulties
Sensory processing differences
Sometimes ADHD is the primary difficulty. Sometimes it is one part of a broader neurodevelopmental profile.
A thoughtful assessment considers the whole picture — not just whether criteria for ADHD are met.
ADHD and Autism (AuDHD)
We know that autistic individuals are more likely to experience ADHD traits, and many people with ADHD also describe autistic characteristics.
Increasingly, we recognise that some young people meet criteria for both autism and ADHD — sometimes referred to as AuDHD.
In these children, ADHD may present differently.
For example:
A strong internal urge to move or act impulsively may be present, but inhibited by a need to follow rules or meet expectations
A child may appear outwardly compliant while experiencing significant internal restlessness
In this way, ADHD-related behaviours can be masked by factors associated with autism. Often, it is anxiety that becomes most visible to adults.
Autism can also amplify ADHD-related challenges. For example:
Executive functioning difficulties may be compounded by sensory overload or social exhaustion
Without understanding both profiles, important aspects of a child’s experience can be missed.
A good assessment considers how these differences interact — not just whether they are present.
Masking and why it matters
Masking refers to the conscious or unconscious effort to hide difficulties in order to fit in, meet expectations, or avoid standing out.
This can look like:
Suppressing the urge to move in class
Forcing eye contact
Copying peers socially
Holding it together all day and then melting down at home
Internalising distress rather than expressing it outwardly
Masking is not explicitly reflected in DSM-5 diagnostic criteria. This means more subtle or internalised presentations, particularly in girls and teenagers, can be overlooked.
A young person who appears “fine” in school may be working incredibly hard to maintain that appearance.
Part of a good assessment is understanding not just what is visible, but what it costs the child to sustain it.
What should happen during an ADHD assessment?
While services vary, a comprehensive ADHD assessment for children in the UK should include:
1. Developmental history Exploring early development, behaviour, regulation and learning over time
2. Multi-informant information Gathering information from more than one setting (usually including school)If a child is home educated, input from other adults may be helpful
Diagnosis should not be based on a single questionnaire alone
3. Standardised rating scales Validated ADHD measures completed by parents and school
4. Clinical interview and observation A detailed discussion alongside observation of attention, behaviour and regulation. This may also include using computerised tools
5. Exploration of overlap and differential diagnoses Considering anxiety, trauma, autism, learning differences and other contributing factors
6. Feedback and written report A clear explanation of whether criteria are met, how this decision was reached, and practical recommendations
A rushed assessment risks missing important nuance. A thorough one builds a meaningful, reliable picture and supports access to appropriate onward care.
NHS and private ADHD assessments
There are excellent ADHD assessments within the NHS, delivered by skilled clinicians. There are also high-quality private assessments that are thorough and neuroaffirmative.
At the same time, less helpful experiences can occur in both systems — often due to time pressures or variability in services.
NHS assessments are free at the point of access, but waiting lists can be long.
Private assessments often offer faster access and more flexibility, but quality varies.
What matters most is not where an assessment takes place, but how it is carried out.
In practice, this includes:
Use of recognised tools
Information gathered from multiple settings
Exploration of co-occurring differences
Clear diagnostic reasoning
A detailed report that can be used by GPs and other services
If medication is being considered, it is particularly important that the assessment meets accepted standards.
If you're also weighing up NHS and private routes, we've written more about how these pathways differ and what to consider in a separate guide
ADHD medication: a balanced perspective
Medication can be very helpful for some young people with ADHD.
It can:
Improve focus
Reduce impulsivity
Support emotional regulation
Increase capacity for learning
However, it is not a complete solution.
It does not:
Teach organisational skills
Address trauma
Remove learning differences
Replace environmental support
Medication works best as part of a broader plan that may include adjustments, psychological strategies, and skill development.
Questions to ask before choosing an ADHD assessment provider
You might consider asking:
Who will conduct the assessment, and what is their experience?
What tools are used?
Is information gathered from school or other settings?
How are subtle or masked presentations considered?
How are co-occurring differences explored?
Is there access to prescribing, or links with other services?
Will the report be recognised by GPs and NHS services?
What support is offered after diagnosis?
These questions are not about challenging a service — but about ensuring a thoughtful, thorough process.
Preparing for an ADHD assessment
Accessing NHS assessment pathways varies across regions, and thresholds for referral can sometimes be high — particularly for more subtle presentations.
It can help to:
Keep notes about patterns you notice
Pay attention to subtle signs (restlessness, avoidance, emotional shifts)
Reflect on differences between home and school
Notice what helps your child regulate or focus
Consider whether difficulties are longstanding or situational
You don’t need to have everything figured out — that’s what the assessment is for. But your observations are valuable.
How we approach ADHD assessment at Insight
At Insight, our ADHD assessments are grounded in a neuroaffirmative and strengths-based approach.
We take time to understand the whole picture — gathering information from multiple sources, using recognised tools, and exploring how different aspects of a child’s profile fit together.
Feedback is collaborative and clear, with practical recommendations that can be
used day-to-day — not just understood in theory.
For many families, it’s not just the diagnosis that matters, but the sense of clarity that comes with being properly understood.
And that’s really the heart of a good assessment.
Not just reaching an outcome — but making sense of a child’s experience in a way that feels accurate, respectful and useful going forward.
If you’re considering an ADHD assessment, or still working out what feels right for your family, we’re always happy to talk things through.
