ADHD Diagnosis - Getting the Right One From the NHS The NHS requires that people undergo a thorough evaluation for an accurate ADHD diagnosis. The BBC investigation highlighted that some private clinics could be distributing unreliable diagnoses and inappropriate medication. A valid diagnosis for ADHD is based on the severity, https://telegra.ph/Who-Is-The-Worlds-Top-Expert-On-ADHD-Private-Diagnosis-03-07