Thanks for your question. PLease see our material at:
Hope this helps and all the best, sue
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There are 7 functional stages for Alzheimer's.
The website above lists out all 7 stages.
There are also 3 stages for Alzheimer's in general: early, moderate and severe stages.
To me, I found that the 7 funcitonal stages are more practical and helpful.
There are no 4 stages, but there are only 3 stages or 7 stages depending on the kind of staging.