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Blood tests have so far been used mainly in carefully controlled research settings. But a new study of nearly 1,200 patients in Sweden shows they can also work in the real-world chaos of doctors’ offices -especially primary care doctors who see far more people with memory problems than specialists but have fewer tools to evaluate them.

In the study, patients who saw either a primary care physician or a memory specialist received an initial diagnosis using traditional screenings, gave blood for testing, and were sent for a spinal tap or brain scan.The blood test was much more accurate, Lund University researchers reported Sunday at the Alzheimer’s Association International Conference in Philadelphia.

Primary care doctors’ initial diagnosis was 61% accurate and specialists’ 73% – but the blood test was 91% accurate, according to the findings, which were also published in the Journal of the American Medical Association.Which blood tests for Alzheimer’s function are best?

There is almost “a Wild West” in the variety on offer, said Dr. John Hsiao of the National Institute on Aging. They measure different biomarkers, in different ways.Doctors and researchers should only use blood tests proven to have an accuracy rate greater than 90%, said Alzheimer’s Association chief science officer Maria Carrillo.

Today’s tests most likely to meet that benchmark measure what’s called p-tau217, Carrillo and Hsia agreed. Schindler helped lead an unusual direct comparison of several types of blood tests, funded by the Foundation for the-National netitutee ef Health, that