How to Get an ADHD Private Diagnosis A private ADHD diagnosis can have a significant impact on your attitude, behavior, and plans. Booking an assessment is not enough. GPs cannot diagnose ADHD. They will only refer you to specialist for an assessment. This is usually a psychologist or psychiatrist. What http://www.stes.tyc.edu.tw/xoops/modules/profile/userinfo.php?uid=1556715