The study's authors found that a blood test 'had high diagnostic accuracy for identifying Alzheimer disease among individuals with cognitive symptoms in primary and secondary care' - showing more accuracy (91%) than the judgments of both primary care doctors (61%) and dementia specialists (73%).
As the researchers pointed out in the JAMA paper, symptomatic Alzheimer's disease is frequently misdiagnosed, hence the interest in discovering a more reliable and concise way of detecting it. That said, the paper's lead author Oskar Hansson stressed that this method of testing should only be used in patients already showing evidence of cognitive decline.
Several pharmaceutical companies are working to develop blood tests and seek FDA approval for them. We haven't reached that point in medical history yet - but it does appear to be coming into focus.
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