From the linked study abstract
>>This blood test (the APS2) had high diagnostic accuracy for identifying Alzheimer disease among individuals with cognitive symptoms in primary and secondary care...
What jumps out at me is that this is for patients *already* exibiting cognitive symptoms. [deep sigh] Whenever I see a study like this I have hopes that there might be something that identifies AD *before* they show any cognitive symptoms - essentially a 'holy grail'. This is certainly a step in that direction - and I hope it leads to an earlier diagnostic.