ADHD Assessment - Why it's Important to Get a Private ADHD Diagnosis Anyone who believes they may have ADHD but has not been diagnosed with it should undergo an ADHD assessment. The process can require up to two sessions. It is suggested to bring along a friend or family member. https://knoxuofbx.dm-blog.com/29860081/15-tips-your-boss-would-like-you-to-know-you-knew-about-adhd-diagnosis-uk-private