Hello Pink, I am sorry about your recent news. May I ask, how old is your brother?
TO answer your question, there is no single test that can or will diagnose Alzheimer's. Doctors will look at a number of different things about the patient, such as language and problem solving skills, and ability to think. They will also do other tests to rule out any other health issues. They will of course, do a blood work up, and maybe even brain scans. Alzheimer's, to the best of my knowlledge, is not a super easy diagnosis. Mainly because it's not like you can do a blood test and say "yep, this man has Alzheimer's." Ya know?
I don't know how involved you will be in your brothers life, as I don't know your whole life story, but if you need support during this, please don't hesitate to come here. Alzheimer's is a tough thing to deal with, not only for the patient, but also for the family and friends who have the sad job of watching.
Wishing you all the best!
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