A side-by-side comparison of the NHS and private routes to an adult ADHD assessment: waiting times, costs, and how to judge which fits your situation.
Quick answer: You can get an ADHD assessment through the NHS via your GP referral or choose a private assessment. NHS assessments are free but involve waiting lists of 18-24 months in most areas. Private assessments cost £800-£1,500 and typically happen within 2-6 weeks of booking.
Over 2.6 million adults in the UK live with undiagnosed ADHD, according to recent estimates from the ADHD Foundation. Many spend decades wondering why they struggle with concentration, organisation, or emotional regulation before seeking assessment.
ADHD assessment in adults requires specialist training and follows NICE guidelines. The process involves detailed developmental history, current symptoms assessment, and ruling out other conditions that might explain your difficulties.
Your two main options are NHS or private assessment routes. Each has distinct advantages, timescales, and requirements that affect your decision.
UK ADHD Assessment Numbers
- Average NHS wait: 18-24 months (varies by region)
- Private assessment cost: £800-£1,500
- Adults with undiagnosed ADHD: around 2.6 million
- NICE guideline compliance: required for both routes
How do I get an ADHD assessment through the NHS?
Start with your GP, who'll assess whether you meet referral criteria for adult ADHD services. NICE guidelines require evidence of symptoms present since childhood and current impairment in multiple life areas. Your GP will complete a referral if they agree assessment is appropriate. NHS adult ADHD services vary by region, with some areas having dedicated clinics while others use general mental health teams.
What information does your GP need?
Bring specific examples of childhood and current symptoms. School reports help enormously if you have them. Your GP needs evidence that difficulties started before age 12 and cause significant problems in work, relationships, or daily functioning.
How long are NHS waiting lists?
Waiting times range from 12 months in well-resourced areas to over three years in others. The average wait across England sits around 18-24 months, though some regions report waits exceeding 30 months.
What's involved in a private ADHD assessment?
Private assessments follow the same NICE guidelines as NHS services but happen much faster. Most private clinics offer comprehensive assessments including clinical interview, symptom questionnaires, and cognitive testing where indicated. The process typically takes 2-3 hours across one or two appointments. Private clinicians must be appropriately qualified - look for consultant psychiatrists, clinical psychologists, or specialist nurses with ADHD training.
How much do private assessments cost?
Expect to pay £800-£1,500 for a full private ADHD assessment. Some clinics offer payment plans or reduced rates for students. Additional costs might include follow-up appointments or shared care arrangements with your GP.
Will my GP accept a private diagnosis?
Most GPs accept private ADHD diagnoses if conducted by qualified clinicians following NICE guidelines. Some operate shared care agreements for medication, though this isn't guaranteed and varies between practices.
Which assessment route should I choose?
Consider your financial situation, urgency of need, and local NHS wait times. If symptoms significantly impact your work or relationships, private assessment offers faster resolution. NHS assessment provides continuity of care and automatic medication prescribing rights. Some people start privately for diagnosis then transfer to NHS care for ongoing treatment. Check your area's specific NHS wait times through your local clinical commissioning group or integrated care board.
What if I can't afford a private assessment?
Some charities offer grants for private ADHD assessments. Workplace health insurance might cover the cost. Student loans sometimes include provisions for learning difficulty assessments, though check your specific terms.
Can I switch between NHS and private care?
Yes, though coordination between services varies. Some people get private diagnosis then join NHS waiting lists for ongoing care. Others use private services for urgent medication reviews while waiting for NHS appointments.
Frequently asked questions
Do I need my GP's permission for private ADHD assessment?
No, you can book private assessment directly. However, getting your GP's involvement early helps with future shared care arrangements and medication prescribing. Many private clinics encourage GP communication throughout the process.
What happens if I don't meet ADHD criteria?
Both NHS and private assessments should identify alternative explanations for your difficulties. You might receive recommendations for other mental health conditions, learning differences, or lifestyle factors affecting concentration and organisation.
Can I get ADHD medication immediately after private diagnosis?
Private psychiatrists can prescribe ADHD medication directly. However, ongoing prescribing often transfers to your GP through shared care agreements. Some GPs require NHS second opinions before taking over prescribing responsibilities.
Are online ADHD assessments legitimate?
Some legitimate clinicians offer video consultations, especially post-pandemic. However, be wary of services offering instant diagnoses or those not following NICE guidelines. Proper assessment requires detailed history-taking and cannot be rushed into single short appointments.
ADHD assessment requires careful consideration of both clinical needs and practical constraints. InKind UK offers comprehensive private ADHD assessments conducted by experienced clinical psychologists, combining thorough evaluation with clear recommendations for your next steps.
