ADHD Diagnosis - Getting the Right One From the NHS For people to get a proper diagnosis for ADHD, the NHS requires a thorough examination. The BBC investigation found that some private clinics might be handing out unreliable diagnosis and inappropriate treatment. A valid ADHD diagnosis is based on symptoms https://telegra.ph/20-Trailblazers-Lead-The-Way-In-UK-Private-ADHD-Diagnosis-03-06