ADHD Diagnosis - Getting the Right One From the NHS The NHS requires that patients undergo a thorough assessment for an accurate ADHD diagnosis. The BBC investigation highlighted that some private clinics might be handing out inaccurate diagnoses and prescriptions. A legitimate diagnosis of ADHD is based on the severity, http://www.stes.tyc.edu.tw/xoops/modules/profile/userinfo.php?uid=1372708