Many adults and parents in the UK wonder how to start the process of getting an ADHD diagnosis. Attention Deficit Hyperactivity Disorder (ADHD) is a neurodevelopmental condition that affects attention, impulse control, and executive functioning.
In recent years, awareness of ADHD has increased significantly. More adults are recognising symptoms later in life, and more children are being referred for assessment. At the same time, NHS waiting lists for ADHD diagnosis have grown in many areas.
This guide explains how ADHD diagnosis works in the UK, including NHS referral pathways, waiting times, private assessment options, and the Right to Choose framework.
ADHD Diagnosis: NHS vs Private Comparison
| Pathway | NHS ADHD Diagnosis | Private ADHD Diagnosis |
|---|---|---|
| Cost | Free at the point of use | £800 – £2,000 typically |
| Referral required | Yes (via GP) | Usually no |
| Waiting time | Often 1–3+ years depending on area | Often 2–12 weeks |
| Assessment provider | NHS specialist teams | Independent clinics |
| Medication access | Through NHS services | Often requires shared care with GP |
Signs you may want an ADHD assessment
People seek ADHD assessments for many different reasons. Some individuals recognise long-standing patterns of difficulty with attention, organisation, or impulsivity, while others may be encouraged to explore assessment by teachers, employers, or healthcare professionals.
Common traits associated with ADHD may include:
- difficulty sustaining attention on tasks
- problems with organisation or time management
- impulsive decision-making
- restlessness or difficulty sitting still
- forgetting appointments or deadlines
ADHD affects people differently, and experiencing these traits does not necessarily mean someone has ADHD. A formal assessment by a qualified clinician is required for diagnosis.
How to get an ADHD diagnosis on the NHS
For most adults in England, the ADHD diagnosis pathway begins with a GP appointment.
During this appointment, you can discuss the symptoms or challenges that have led you to consider whether an ADHD assessment may be appropriate.
If your GP agrees that an assessment may be clinically appropriate, they can refer you to a specialist ADHD assessment service. These services are usually delivered by psychiatrists or multidisciplinary neurodevelopmental teams.
The assessment process may include:
- clinical interviews
- developmental history
- structured diagnostic questionnaires
- review of functioning across different areas of life
Following assessment, the clinician may confirm a diagnosis and discuss treatment options such as medication or psychological support.
NHS ADHD waiting times
Waiting times for ADHD assessments on the NHS vary widely across England. In many areas, demand for ADHD services has increased faster than clinical capacity.
As a result, some patients may wait one to several years for an assessment depending on the region.
You can learn more about typical waiting times in our guide: NHS ADHD Waiting Times in England.
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Right to Choose ADHD assessments
Under the NHS Right to Choose framework, patients referred for their first outpatient appointment may be able to choose an alternative provider rather than joining the local NHS waiting list.
This means that if your GP refers you for an ADHD assessment, you may be able to request referral to another provider that accepts NHS Right to Choose referrals.
Some providers offer ADHD assessments funded by the NHS through this pathway.
Check your Right to Choose eligibility
Use our free eligibility checker to understand if you may be able to use Right to Choose for an ADHD assessment.
Not sure which ADHD route is right for you?
A care navigator can talk through NHS, Right to Choose and private pathways based on your situation — written plan within 48 hours.
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Private ADHD diagnosis
Some patients explore private ADHD assessments if NHS waiting lists are very long.
Private clinics typically allow patients to book an assessment directly without waiting for a referral pathway. Waiting times may therefore be significantly shorter.
However, private assessments involve paying directly for the evaluation.
Typical private ADHD assessment costs in the UK range from approximately:
Key tip
Private ADHD assessment costs: £800 to £2,000 depending on the provider and assessment process.
If you are considering private diagnosis, it can be helpful to understand how this differs from NHS pathways. Read our guide: Private ADHD Diagnosis vs NHS.
ADHD diagnosis for adults vs children
The ADHD diagnostic pathway may differ depending on whether the assessment is for an adult or a child.
Children are often referred through schools or paediatric services, while adults usually begin the process through a GP referral.
Adult ADHD diagnosis has become more common in recent years as awareness of the condition increases.
What happens after an ADHD diagnosis
After an ADHD diagnosis, clinicians may discuss several possible next steps depending on the individual situation.
These may include:
- medication treatment
- psychological support or coaching
- workplace or educational adjustments
- follow-up appointments to monitor treatment
Treatment plans are tailored to the individual and may involve a combination of approaches.
Comparing ADHD assessment providers
If you are exploring ADHD diagnosis options, it may be helpful to understand the different pathways available and compare providers.
Find Care Compare helps patients navigate NHS referral pathways and explore available ADHD assessment providers.
Related guides
The Complete Guide to NHS Right to Choose
Understand your legal right to choose your NHS provider and how it can reduce waiting times.
NHS ADHD Waiting Times in 2026
A clear guide to the full ADHD pathway — assessment waits, Right to Choose timelines, and how to reduce your wait.
How to Ask Your GP for an ADHD Referral
A practical step-by-step guide to preparing for your GP appointment and requesting an ADHD assessment.
NHS ADHD Diagnosis vs Private
Costs, waiting times, medication access and shared care compared across NHS and private pathways.