Investigating a suspected cognitive disease/dementia involves many pieces of the puzzle. At present, there is no single sample or test that provides a quick answer. The investigation therefore contains many different parts and elements in order for a possible diagnosis to be made. The parts of the investigation are specified in a national care program that clearly describes the constituent parts. In simple terms, it is divided into a basic dementia assessment and an extended dementia assessment. The basic assessment is usually carried out in primary care and the extended assessment is carried out at a specialized memory clinic or cognitive clinic.