ADHD assessment in children
A thorough specialist assessment to find out whether a child's difficulties with attention, activity or impulsivity are due to ADHD, and what would help.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- Only a qualified specialist should diagnose ADHD, using a thorough assessment across more than one setting, not a quick online test.
- A reliable assessment takes time and information from several sources, including parents, the young person and school.
- ADHD can look like, or occur with, anxiety, low mood, sleep problems, learning difficulties or autism, so other explanations are checked.
- A same-day or guaranteed diagnosis, or one based on a single online questionnaire, is a warning sign of a poor-quality service.
A plain-English summary. The detail — including risks and recovery — is below.
At a glance
A general guide. Your psychiatrist will give you advice for your situation.
Gives a careful, evidence-based answer to whether ADHD is the right explanation.
When a child is in crisis or at immediate risk and needs urgent help rather than a planned assessment.
Information is gathered over more than one appointment and from school, building a picture over time rather than from a single visit.
A clear, written report and a plan the family and school can use.
Information is gathered over more than one appointment and from school, building a picture over time rather than...
The specialist explains their conclusions, whether or not ADHD is diagnosed, and what they recommend.
A written report and plan usually follow, and are shared with the GP and, with consent, school.
Agreed support begins, which may include school adjustments, behavioural strategies, parent support and, where...
What is an ADHD assessment in children?
An ADHD assessment is a careful, specialist process to find out whether a child or young person's difficulties with attention, activity levels or impulsivity are best explained by attention deficit hyperactivity disorder (ADHD). ADD is an older term for the type without much hyperactivity. Only a suitably qualified specialist, such as a child and adolescent psychiatrist or a paediatrician with the right training, should make the diagnosis.
A proper assessment follows the national (NICE) pathway. It gathers information from more than one source, usually parents, the young person and school, because ADHD must show up across different settings, not just at home or only at school. It uses a full clinical interview, often questionnaires, and information about the child's development and history.
ADHD is more than being lively or distractible. The difficulties must be present from childhood, happen in more than one setting, and genuinely interfere with learning, friendships or daily life. The assessment also looks for other explanations, because anxiety, low mood, sleep problems, learning difficulties and autism can look similar or occur alongside ADHD.
A reliable diagnosis takes time and more than one source of information. A quick online questionnaire or a single short appointment promising a same-day diagnosis is a red flag and is not how a safe ADHD assessment is done.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
A proper assessment vs a quick label
| Thorough assessment | Quick online "diagnosis" | |
|---|---|---|
| Sources | Family, child and school | Often one questionnaire |
| Time | Several steps over weeks | Minutes to a single visit |
| Other causes | Carefully considered | Often ignored |
A same-day or online-only ADHD diagnosis is a red flag; a safe assessment gathers information from more than one setting over time.
Preparing for your test
- Talk to your child gently about the appointments and that the aim is to understand and help.
- Write down the main difficulties, when they started, and how they affect school, friendships and home.
- Gather school reports, and ask whether teachers will complete the questionnaires the service sends.
- Note your child's early development, health, sleep, and any allergies or medicines.
- Bring any previous assessments, reports or diagnoses.
- Think about whether difficulties happen in more than one place, as this matters for ADHD.
- Complete any rating scales or questionnaires sent in advance.
- Note anything that helps or makes things worse, and what you hope the assessment will achieve.
What happens
A safe assessment is a process, not a single appointment. The specialist takes a detailed history from you and your child, covering current difficulties, development, health, sleep, school, friendships and home life. They will want information from school as well, because ADHD has to be present in more than one setting.
They often use standardised questionnaires completed by parents and teachers, and may observe your child. They carefully consider other explanations, such as anxiety, low mood, sleep problems, learning difficulties or autism, and whether any of these are present alongside attention difficulties.
The clinician weighs all of this against the recognised criteria for ADHD: the difficulties must have been present from childhood, occur in more than one setting, and clearly interfere with daily life. This usually takes more than one appointment and gathering information over a few weeks.
At the end, they explain their conclusions, whether or not that is a diagnosis of ADHD, and discuss a plan. They usually write to the GP and, with consent, to school.
Is this test right for me?
A good consultation should explore whether it's the right choice for you now — including reasons to wait or consider something else.
May not be suitable if…
- When a child is in crisis or at immediate risk and needs urgent help rather than a planned assessment.
- When difficulties appear in only one setting, which points away from ADHD and towards another explanation.
- When parents are seeking a quick label or a route to medication without a full assessment.
- When an untreated problem, such as a sleep disorder, anxiety or a learning difficulty, should be addressed first.
Delay or rearrange if…
- There is an unmanaged crisis or safety concern that must be dealt with first.
- Key information, especially from school, is missing and would change the picture.
- A recent major life event or change means current behaviour may not be typical.
- An untreated sleep, mood or anxiety problem could be driving the difficulties.
- The family needs time to prepare the child and gather information.
Alternatives to discuss
- Speaking with school and the GP first, who may offer support or referral.
- Addressing sleep, anxiety, low mood or learning needs that may explain the difficulties.
- Behavioural and parenting strategies and school adjustments as a first step.
- A broader mental health assessment if the picture is unclear.
- Watchful waiting with support if difficulties are mild or recent.
Before you decide
Use this as a shared-decision checklist. The aim is not just “can this be done?”, but whether it is right for you, now, with the risks and alternatives clearly understood.
What matters most to me?
Think about symptoms, daily life, work, caring responsibilities, sport, fertility, travel, appearance and anxiety — the right choice depends on your priorities, not just the medical facts.
What are all my options?
Ask about waiting, monitoring, medicines, rehabilitation, a smaller or larger procedure, a different test, NHS referral, or a second opinion where that would help.
What would make me pause?
Active infection, pregnancy, unstable medical problems, smoking, medicines that increase bleeding, poor support at home, or feeling pressured are all reasons to slow down and get tailored advice.
What happens if I do nothing today?
For some problems, waiting is safe; for others, delay can make treatment harder. A good consultation should explain the trade-off in plain English.
Benefits
- Gives a careful, evidence-based answer to whether ADHD is the right explanation.
- Identifies other or co-occurring difficulties that also need support.
- Helps the child, family and school understand the difficulties and respond better.
- Opens the door to the right support at school and, where appropriate, treatment.
- Reduces the risk of a wrong label by considering the whole picture over time.
Risks & complications
- The process taking longer than families hope, because doing it properly takes time.
- The child or young person feeling scrutinised or labelled.
- Uncertainty if the picture is mixed and a clear answer is not immediate.
- Disagreement between home and school reports, which needs careful interpretation.
- A conclusion that is not what the family expected, in either direction.
- The need for further assessment, for example for autism or learning difficulties.
- An incorrect diagnosis if the assessment is rushed or based on too little information.
- Missing another condition if attention difficulties are assumed to be ADHD without proper checks.
The main risks come from doing the assessment too quickly or from too few sources. ADHD looks like several other conditions and often occurs alongside them. Ask how information will be gathered from more than one setting, who is qualified to make the diagnosis, how long it will take, and how other explanations will be ruled in or out. Be wary of any service offering a same-day or online-only diagnosis.
Published figures to discuss
There are no procedural complication rates, because this is an assessment, not a procedure. The real issues are diagnostic accuracy: rushed or single-source assessments risk both over-diagnosis (labelling normal variation or another condition as ADHD) and under-diagnosis (missing ADHD or a co-occurring condition). Gathering information from more than one setting over time reduces these errors.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| ADHD diagnosis missed or over-diagnosed | Recognised diagnostic risk | NICE requires symptoms, impairment, onset, pervasiveness and information from home and school, not a checklist alone. | NICE NG87 — ADHD: diagnosis and managementnice.org.ukSource-linked context |
| Coexisting condition missed | Common | Autism, anxiety, sleep problems, trauma, learning difficulty, tics and mood problems often overlap with ADHD. | Guide sourcesClinical context |
| School information incomplete | Common practical problem | Teacher reports, educational history and observations help avoid basing diagnosis only on a clinic snapshot. | NICE NG87 — ADHD: diagnosis and managementnice.org.ukSource-linked context |
| Medication assumed to be the only answer | Avoidable | Good assessment links diagnosis to psychoeducation, school support, parent strategies and, where appropriate, medication discussion. | Guide sourcesClinical context |
These are literature figures, not a personalised prediction. Your own risks and likely benefits depend on your circumstances, your health, and how your care is carried out and followed up.
What happens afterwards
There is no physical recovery. "Afterwards" means the conclusions you are given, any report, and the support and review that follow.
- Feeling that the process takes time and patience.
- Mixed emotions for the family, including relief and worry, after feedback.
- Waiting a short while for the written report.
- Realising a diagnosis is a starting point for support, not an instant fix.
Aftercare
- Read the report and ask the team to explain anything you do not understand.
- Share the findings with school, with consent, so the right support can be put in place.
- Follow up on agreed strategies and support, which are often as important as any medicine.
- If medication is recommended, discuss the plan, including monitoring, before starting.
- Note how your child is doing across settings to discuss at review.
- Keep contact details for questions and a route for urgent concerns.
- Main difficulties and their timeline written down
- School reports gathered and teacher questionnaires requested
- Developmental history, sleep, health and medicines noted
- Any previous assessments or reports collected
- Rating scales or questionnaires completed
- Crisis numbers saved (999; Samaritans 116 123; Papyrus HOPELINE247 0800 068 4141)
⚠ Get urgent help if…
- Any immediate risk to your child's safety — call 999 or go to A&E.
- Talk of suicide, plans to harm themselves, or serious self-harm — seek urgent help; Papyrus HOPELINE247 (0800 068 4141) supports under-35s, and Samaritans (116 123) is available any time.
- A marked drop in mood, severe anxiety or withdrawal.
- Behaviour that puts your child or others at risk.
- Signs your child is being harmed, bullied or exploited.
- A service pressuring you towards a same-day diagnosis or straight to medication without a proper assessment.
Who to contact: your clinician, clinic or test provider first (keep their number to hand). For urgent advice when you can't reach them, call NHS 111. In an emergency, call 999.
General guidance — it doesn't replace the specific advice your psychiatrist gives you.
Results & realistic expectations
A good assessment gives a clear, reasoned conclusion about whether the difficulties are due to ADHD, what else may be going on, and what will help. A diagnosis, when made, should be based on difficulties present from childhood, across more than one setting, that genuinely interfere with daily life.
An assessment cannot, and should not, guarantee a particular outcome, and a responsible service will sometimes conclude that it is not ADHD, or that more time or information is needed. A diagnosis is a starting point for support, not a label that fixes things on its own.
ADHD is generally a long-term, developmental condition, but how it shows up changes with age, and so do a child's needs and the support that helps. A diagnosis made now usually remains relevant, but plans should be reviewed regularly as the child grows and moves through school. If the picture was unclear, reassessment over time may be needed.
Related tests, treatments or support
An ADHD assessment often sits alongside a wider mental health assessment and may lead to further assessment for autism, learning difficulties, anxiety or low mood, which commonly occur with ADHD. Where medication is considered, it is one part of a wider plan that includes support at school and home.
Follow-up & long-term care
Follow-up depends on the conclusions. It may include school support, behavioural and parenting strategies, and review appointments. If medication is started, monitoring is set up (see the ADHD medication guide). The GP is kept informed, and, with consent, school is too, so support joins up around the child.
Repeat, follow-on and what comes next
- A first assessment may lead to further assessment, for example for autism or learning difficulties.
- Conclusions can change as more information arrives or as the child grows.
- A diagnosis may be revised or added to over time.
- If the picture is unclear, reassessment after a period of support and monitoring may be needed.
Ask what happens if the result is unclear or needs repeating, and what is included if further tests or follow-up are needed.
What good aftercare looks like
- A clear, written report and a plan the family and school can use.
- Support beyond medication: school adjustments, behavioural strategies and parent support.
- If medication is started, a proper monitoring plan and review (see the ADHD medication guide).
- Liaison with the GP and, with consent, school so support joins up.
- A crisis route and signposting (999 for a life-threatening emergency; for urgent non-life-threatening advice use NHS 111 in England, Scotland or Wales, or contact GP out-of-hours or your HSC Trust's Phone First service in Northern Ireland; Samaritans 116 123; Papyrus HOPELINE247 0800 068 4141).
What affects the cost
Costs vary a great deal between people and providers, and we don't publish prices. What matters is understanding what drives the cost and making sure your quote is complete. The main things that affect it:
- The number of appointments and the time spent gathering and reviewing information.
- Whether information and questionnaires are obtained and scored from school as well as home.
- The seniority and expertise of the diagnosing specialist.
- Whether the assessment is in clinic, at school or by video.
- The complexity of the picture and whether further assessment is needed.
- Whether a detailed written report and follow-up are included.
- The specialist's fee and what the assessment includes (number of appointments).
- Whether school information and questionnaires are gathered and scored.
- Whether a written report and a clear plan are included.
- Whether follow-up, or medication initiation and monitoring, is included or separate.
- Whether liaison with the GP and school is included.
- The expected timescale for the assessment and report.
- What happens, and what is charged, if further assessment is needed or it is not ADHD.
On the NHS? ADHD assessment is available on the NHS, usually after referral, though waits vary; private assessments may be used for speed but should follow the same thorough, multi-source standards.
You're entitled to your total cost in writing — including reports, follow-up and what happens if the result is inconclusive — before you decide.
Consent traps and marketing red flags
These are not small details. They are often where patients lose choice, time to reflect, or realistic expectations.
Consent traps
- Diagnosing from a single source or a single short appointment.
- Not gathering information from school across more than one setting.
- Promising a same-day or guaranteed diagnosis.
- Failing to consider or explain other conditions that look like ADHD.
- Moving straight to medication without explaining the wider plan and monitoring.
Marketing red flags
- Same-day or guaranteed ADHD diagnosis.
- Online-only assessment with no school information.
- Diagnosis tied to immediately selling or starting medication.
- No consideration of other or co-occurring conditions.
- Claims that ADHD can be confirmed from a brief questionnaire alone.
Choosing a specialist safely
- Check the psychiatrist is on the GMC Specialist Register for this area.
- Make sure they work at a CQC-registered service, and look for membership of the relevant Royal College or professional body.
- You're entitled to time to consider and to have your questions answered before you agree — the psychiatrist who looks after you should explain it, not a salesperson.
- Be wary of pressure: time-limited offers or deposits taken before you've had time to think are red flags, not bargains.
- You're entitled to your total cost in writing — including any follow-up — before you decide.
Questions to ask your medical professional
Take this to your consultation. A good psychiatrist will welcome every one of these.
- Who will make the diagnosis, and what are their qualifications in ADHD?
- How will you gather information from more than one setting, including school?
- How will you check for other conditions that can look like or occur with ADHD?
- How long is the assessment likely to take, and what are the steps?
- If it is ADHD, what support do you recommend besides any medication?
- If it is not ADHD, what will you look at next?
- Are you on the GMC Specialist Register for this area, and which Royal College or professional body are you a member of?
- Will you be the psychiatrist who carries out my test, and who looks after me afterwards?
- What are the risks for someone like me, and how often do your own patients have a problem or need it repeated or redone?
- What does a realistic result look like — and what can this test not achieve?
- What are my options, including waiting, doing nothing for now, or choosing a different approach?
- Can I have written information, results and aftercare instructions in a format I can use, including any accessibility or communication support I need?
- What is the total cost in writing, including any follow-ups, and how much time do I have to decide?
Frequently asked questions
Can my child be diagnosed with ADHD from an online test?
Who can diagnose ADHD?
Why does it need information from school?
Can we get this on the NHS?
Does a diagnosis mean medication?
What if it turns out not to be ADHD?
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How we made this page
Medically reviewed by a GMC-registered consultant. Written in plain English, checked against NHS, NICE, GMC and relevant Royal College / specialist-society guidance, and kept under review. No clinic paid to appear on this page, and we publish no pricing. This is general information to help you prepare — it is not a substitute for advice from your own clinician. How we review our guides →
Source hierarchy: UK regulator and NHS/NICE guidance first, then relevant Royal College or specialist-society guidance, then peer-reviewed evidence for procedure-specific figures where available.
Sources & standards: NICE NG87 — ADHD: diagnosis and management NICE QS39 — ADHD quality standard NHS — Attention deficit hyperactivity disorder (ADHD): diagnosis ADHD Foundation YoungMinds — ADHD nidirect — urgent and emergency care services nidirect — GP out-of-hours service
Reviews reflect patients' experience of care, not clinical outcomes. For procedure volumes and outcome data see PHIN.
Last medically reviewed 2026-09-21. Spotted something wrong or out of date? Report an error in this guide.
Related guides: ADHD medication management for children · Child and adolescent mental health assessment · Combined ADHD and autism assessment · Learning difficulties assessment · Self-harm assessment