Alzheimer’s blood test detects risk 15 years before symptoms

A simple blood test can detect the earliest stages of Alzheimer’s, a study has found, with “huge implications” for routinely screening everyone over 50 for their risk of developing the disease.

Scientists in Sweden have taken a simple testing kit that is already commercially available to researchers and found that it can detect tau proteins in the blood, which can cause Alzheimer’s and start to build up on the brain 10 to 15 years before symptoms start showing.

It could be used to test people of any age who fear they have the disease, experts said.

In a study of people in their fifties, sixties and seventies, the test allowed researchers to assess whether participants were very likely or very unlikely to develop Alzheimer’s, or

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