ADHD Diagnosis - Getting the Right One From the NHS For people to get an accurate diagnosis for ADHD, the NHS requires a thorough evaluation. The BBC investigation found that certain private clinics may be handing out unreliable diagnoses and inappropriate medication. A valid ADHD diagnosis is based on symptoms https://telegra.ph/15-Funny-People-Working-Secretly-In-How-Much-Is-A-Private-ADHD-Assessment-03-06