How to Get an ADHD Private Diagnosis A private ADHD diagnosis can have a major impact on your attitude, behavior, and plans. However, it's not as easy as simply booking an appointment. The GPs aren't able to diagnose ADHD and can only refer you for an assessment by an expert. http://www.stes.tyc.edu.tw/xoops/modules/profile/userinfo.php?uid=1373066