ADHD Assessment - Why it's Important to Get a Private ADHD Diagnosis The process of getting an ADHD assessment is essential for anyone who believes they might have undiagnosed ADHD. The process could take between 2 and 3 sessions. It is recommended to bring along a friend or family member. https://louisasiug.tinyblogging.com/a-provocative-rant-about-adhd-diagnosis-uk-private-73546652