A simple blood test could help spot Alzheimer's disease far earlier.
Research teams from the University of Oxford and University College London (UCL) will lead trials that will be available to thousands of Brits concerned about their memory.
The tests have proven to be very effective at the research stage and scientists are desperate to work out if they could improve the UK's "shocking" diagnosis rates.
At present, getting a formal diagnosis relies on mental ability tests as well as painful and invasive lumbar punctures.
Dr. Sheona Scales, director of research at Alzheimer's Research UK, said: "We've seen the enormous potential that blood tests are showing for improving the diagnostic process for people and their loved ones in other disease areas. Now we need to see this same step change in dementia, which is the greatest health challenge facing the UK.
"It's fantastic that through collaborating with the leading experts in the dementia community, we can look to bring cutting-edge blood tests for diagnosing dementia within the NHS. And this will be key to widening access to groundbreaking new treatments that are on the horizon."