ADHD Assessment - Why it's Important to Get a Private ADHD Diagnosis The process of getting an ADHD assessment is important for anyone who thinks they may have undiagnosed ADHD. The process can take between 2 and 3 sessions. It is recommended to bring along a friend or family member. https://psychiatryuk98227.blogrelation.com/35872100/adhd-diagnosis-uk-private-explained-in-less-than-140-characters