A major new blood test which could revolutionise the diagnosis of Alzheimer's is being trialled on UK patients with early symptoms, researchers have said.

People with suspected dementia are being recruited via memory clinics across the country to see how well the test, which measures the protein p-tau217, works in the NHS .

Alzheimer's disease is the most common cause of dementia and is linked to the build-up of two key proteins in the brain called amyloid and tau.

P-tau217 is considered a promising biomarker which shows both amyloid and tau are present in the brain.

A team led by University College London (UCL) is running the trial as part of the Blood Biomarker Challenge.

Their aim is to understand if the test, which analysts suggest can tell around 80% of people with cognit

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