FAST can be used for Alzheimer's and 'generic' dementia. Alzheimer's disease pts must be ordinal. However, other dementias do not have to be ordinal. One very important thing to be sure of though, is the pt unable to ambulate due to dementia processes, or other reasons, such as weakness. There are lots of articles on the internet about it's use. Reisburg (the creator of the tool) has several articles on it's proper use.