ADHD Diagnosis - Getting the Right One From the NHS The NHS requires that people undergo a thorough assessment in order to get an accurate ADHD diagnosis. The BBC investigation highlighted that some private clinics may be distributing inaccurate diagnoses and prescriptions. A reliable diagnosis of ADHD is based on http://www.stes.tyc.edu.tw/xoops/modules/profile/userinfo.php?uid=1373090