How to Get an ADHD Private Diagnosis A private ADHD diagnosis can have a major impact on your attitude, behavior, and plans. Making an appointment for an assessment isn't enough. GPs cannot diagnose ADHD. They can only refer you to specialist for an assessment. This usually involves a psychiatrist or http://www.stes.tyc.edu.tw/xoops/modules/profile/userinfo.php?uid=1373009