UK researchers on Wednesday announced the trial of a blood test for Alzheimer's which it is hoped will transform diagnosis of the disease.

Researchers at University College London (UCL) will assess whether the test could improve the accuracy of diagnosis from 70 percent to over 90 percent.

Medics say early diagnosis is critical with Alzheimer's, which is the most common cause of dementia, as the earlier treatment is started the more effective it is.

Around 1,100 people will be recruited through some 20 memory clinics to take part in the trial, which will assess how well the test can work in the UK's National Health Service (NHS).

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

The new blood test measures the protein p-tau217, whic

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