Alzheimer’s test predicts onset up to 20 years in advance

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US scientists say their blood test can be 94% effective in spotting those at risk of the illness

A blood test that can detect signs of Alzheimer’s as much as 20 years before the disease begins to have a debilitating effect has been developed by researchers in the US.

Scientists at the Washington University School of Medicine in St Louis in Missouri believe the test can identify changes in the brain suggestive of Alzheimer’s with 94% accuracy, while being much cheaper and simpler than a PET brain scan.

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