ADHD Assessment - Why it's Important to Get a Private ADHD Diagnosis Anyone who believes they may be suffering from ADHD but has not been diagnosed should seek an ADHD assessment. The process could take up to two hours, and it's best to bring a family member or acquaintance along. https://psychiatryuk62940.thelateblog.com/29931089/adhd-diagnosis-uk-private-it-s-not-as-difficult-as-you-think