Clinical assessment tests are used to aid in the confirmation of a diagnosis of dementia. The tests determine patterns of impairment such as orientation to place and time, memory, language skills, praxis (executive function), attention, visual perception, problem solving skills and social function. These tests are useful for assessing changes over time and for changes in response to treatment intervention. The tests should be short and relatively simple to administer, particularly for assessment purposes since patients often cannot tolerate lengthy testing. Some tests, such as the Functional Activities Questionnaire, may be administered to a caregiver for a more accurate assessment. There are several tests in each category, with some of the more common listed here.

The MMSE is probably the most popular cognitive assessment test, although it has some limitations. Patients given the MMSE are required to have at least an eighth grade education. Visual or hearing impairment may hinder performance, as well as changes due to arthritis or other musculoskeletal problems which can impair performance that require a physical activity, such as writing a sentence or drawing a design. The maximum score on the MMSE is 30. If subjects are unable to perform certain tasks due to physical limitations, the maximum score should be adjusted by the rater. Dementia on the MMSE is defined as 24 or less out of 30 points.