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Like many progressive diseases, dementia can be described using stages. Staging is based on a person's ability to remember, complete tasks, follow directions, and their need for help. There are many tools and assessments that can be used to guide staging, but there isn't one that is the "industry standard."
Staging assessments go through rigorous evaluation and testing before becoming widely accepted and used. They are designed to be administered by trained clinicians to ensure the assessment is given correctly and the results are tallied accurately. The Functional Assessment Staging (FAST) and Global Deterioration Scale (GDS) are commonly used to identify a person's level of decline on a scale of 1-7. To simplify things, we often use broader categories to describe stages as early/mild, middle/moderate, and late/advanced.
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