It is certainly a test to clarify cognitive dysfunction. For me, as someone with a recent diagnosis of mild cognitive disorder, I will repeat annually to document the rate of disease progression. It is not treatment per se. But the Neuropsychologist did also recommend some strategies for assimilating the diagnosis.
I had a test for my genetic predisposition for Alzheimer's and a blood test that documented the presence of Alzheimer's disease by measuring Tao and Beta Amyloid levels. Finally I had an MRI to evaluate whether I have lost any brain volume.
So its a complex baseline and since I live alone and like it, over time the periodic updates will allow me to time when I will trigger various decisions such as turning over my car keys, or removing all my candles (which I love), or ultimately moving to an assisted living facility.
So my path likely isn't anyone else’s but i always choose more data over less in my decision process.
My hopes for you and your wife going forward.