ADHD Diagnosis - Getting the Right One From the NHS The NHS requires that people undergo a thorough assessment in order to get a proper ADHD diagnosis. The BBC investigation found that certain private clinics could be distributing inaccurate diagnoses and prescriptions. A valid ADHD diagnosis is based on symptoms, http://www.stes.tyc.edu.tw/xoops/modules/profile/userinfo.php?uid=1909658