Scientists confirm blood test could track Alzheimer's disease

The protein is called neurofilament light. It spills out of damaged and dying nerve cells, into the cerebrospinal fluid and then travels from there into the bloodstream.

Previous studies have already demonstrated that blood levels of neurofilament light are higher in people with diseases, such as Alzheimer's, that destroy nerve cells and tissue in the brain. However, few of these have been long-term investigations.

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