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I think there are many factors that go into exploring details about the dementia, but, normally, knowing why is helpful, because it could be due to something that is treatable, as stated upthread. After primary doctor diagnosis, we saw neurologist to rule out brain tumor, vitamin deficiency, fluid on the brain, etc. We also got a good idea of her progression, as he did more tests of her reflexes, gait, etc. And, the MRI was helpful. as it gave a baseline.
I do understand that some families do not pursue multiple tests, if there LO is already terminally ill, immobile, advanced in age, on Hospice, etc.