ADHD Diagnosis - Getting the Right One From the NHS The NHS requires that people undergo a thorough examination for an accurate ADHD diagnosis. The BBC investigation revealed that a few private clinics may be giving inaccurate diagnoses and prescribing inappropriate treatment. A valid ADHD diagnosis is based on symptoms http://www.stes.tyc.edu.tw/xoops/modules/profile/userinfo.php?uid=1372554