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I think that although technically psychologists can diagnose (because they do have to put a diagnosis on the paperwork to be reimbursed by insurance) it is not considered 'official' unless and until it is done by a psychiatrist.
I believe the most thorough evaluation is the neuropsychological evaluation, which are conducted by experts in administering these tests. It takes several hours. This would make it official (and as I say, probably from a regular psychiatrist as well).
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