Global deterioration scale refers to a psychiatric tool charting stages of dementia. In adult guardianship cases the global deterioration scale is a useful and frequent tool of medical evidence. It is the cognitive decline associated with old age and consistent with the diagnosis of primary degenerative dementia is a unique clinical syndrome with characteristic phenomena and progression. The scale sets out seven stages. They are; normal, objectively normal but complaints of mild memory loss, mild cognitive impairment, early dementia, moderate dementia, moderately severe dementia, and severe dementia.