ABSTRACT
Life expectancy is increasing both in the general population and the population of people with intellectual disabilities. As they age, they also face age-related problems, including dementia. In this population, the diagnosis of dementia can be difficult, and therefore it’s necessary to adapt existing or develop new instruments. Our identified research question was: “Which instruments for diagnosing dementia in people with intellectual disabilities have been described and what are their usefulness and interoperability?” We used three databases for searching the literature (Web of Science, Pubmed, and Scopus), identified and selected relevant studies, and analyzed the chosen articles in detail. We provided a review of existing instruments for diagnosing dementia in people with intellectual disabilities. We defined 24 various instruments for diagnosing dementia among people with intellectual disabilities. The most common are CAMDEX-DS, CLD, and DSQIID; the newest of all analyzed instruments is WDTIM. There are several existing diagnostic instruments for dementia in people with intellectual disabilities, but established research suggests that not all resulting evaluations necessarily agree with each other.