Understanding ADHD Assessment in the UK: A Comprehensive Guide by Dr. Adeel Sarwar

Getting an ADHD assessment in the UK looks very different depending on whether you access it through the NHS or privately. Wait times, costs, the role of GPs, and what happens after diagnosis all differ — and understanding the system before you start can prevent months of unnecessary delay or confusion.

The NHS Pathway

In England, Wales, and Northern Ireland, adults seeking an ADHD assessment through the NHS begin with their GP. The GP's role is to conduct an initial conversation, rule out other explanations for the presenting symptoms, and make a referral to a community mental health team (CMHT) or specialist ADHD service if ADHD is clinically suspected. GPs are not expected to diagnose ADHD themselves — their role is gatekeeping access to specialist assessment.

Once referred, adults face the most significant obstacle in the system: wait times. As of 2023–2024, NHS ADHD assessment waits across England range from 18 months to 7 years depending on the trust. NHS England's Right to Choose policy (introduced in 2022) gives patients in England the legal right to request their GP refer them to any NHSE-commissioned provider, including those with shorter wait times. Recognised Right to Choose providers include Psychiatry UK, ADHD 360, and Healios. Exercising this right requires a written referral from your GP specifying the patient's Right to Choose — it does not happen automatically.

In Scotland, Right to Choose does not apply, and provision varies considerably by health board. NHS Lothian and NHS Greater Glasgow and Clyde have developed adult ADHD pathways; rural health boards often have minimal specialist provision.

The Private Pathway

Private ADHD assessments in the UK typically cost between £500 and £1,500 for an adult evaluation. The assessment is usually conducted by a consultant psychiatrist or a specialist psychologist and involves a clinical interview, rating scales (such as the Conners CAARS or Barkley Adult ADHD Rating Scale), and a review of childhood history. A thorough private assessment should take at least 2–3 hours across one or more sessions.

Private diagnosis in the UK creates a specific complication: NHS GPs are not required to prescribe ADHD medication on a private diagnosis if they are not satisfied with the clinical evidence presented. A "shared care agreement" — in which the private prescribing psychiatrist and the NHS GP share prescribing responsibilities — is the standard mechanism but requires the GP's agreement. Some GPs decline, particularly in areas where local NHS guidance does not support shared care. This is an active policy issue: NHS England's 2023 guidance strongly encourages GPs to enter into shared care arrangements where the private diagnosis is robust.

What the Assessment Involves

A NICE-compliant ADHD assessment (NICE Guideline NG87) in the UK must include: a full clinical interview covering current symptoms, developmental history, and functional impairment; standardised rating scales completed by the patient and, where possible, an informant (parent, partner, or close friend); consideration of co-existing conditions; and review of previous records where available. The clinician must also consider differential diagnoses — anxiety, depression, bipolar disorder, ASD, and sleep disorders — before confirming ADHD.

NICE NG87 recommends that a diagnosis of ADHD is made only by a specialist — a psychiatrist, paediatrician, or specialist nurse — not by a GP alone.

After Diagnosis: Medication and Support

First-line ADHD medications in the UK include methylphenidate (Ritalin, Concerta), lisdexamfetamine (Vyvanse/Elvanse), and atomoxetine (Strattera). These are controlled substances requiring specialist initiation; the GP typically takes over repeat prescribing once the dose is established under a shared care agreement. ADHD UK (adhduk.org.uk) maintains an up-to-date map of NHS services and guidance for navigating the system.

For adults who cannot access NHS assessment in a reasonable timeframe, ADHD UK also maintains a list of NHSE-approved Right to Choose providers whose waiting times are substantially shorter than many local trusts.

Children and Young People

For children under 18, assessment is typically conducted through CAMHS (Child and Adolescent Mental Health Services). As with adult services, wait times are a significant barrier — a 2022 report by Young Minds found average CAMHS waits of 18 weeks to first appointment, with considerable regional variation. Paediatric assessment includes parent and teacher rating scales (the Conners 3 is commonly used), school observation where possible, and a developmental history interview with parents.

If you are comparing costs and pathways across countries, our article on ADHD testing costs in the UK, US, India, and Canada provides a comparative overview. For a detailed look at what a full evaluation involves, see our comprehensive ADHD testing guide.

Dr. Adeel Sarwar, PhD, is a mental health professional specialising in a broad spectrum of psychological conditions such as depression, anxiety, ADHD, eating disorders, and obsessive-compulsive disorder (OCD). Armed with years of experience and extensive training in evidence-based therapeutic practices, Dr. Sarwar is deeply committed to delivering empathetic and highly effective treatment.