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Currently, a third of dementia cases are believed to go undiagnosed and untreated but that could change with the introduction of a new screening process, reports the Daily Mail.
Experts say that tests to detect Alzheimer's and other forms of dementia could be introduced within two years, which would effectively screen everyone over the age of 65 for the disease.
At the moment, doctors usually base their diagnosis on memory tests which include questions such as 'where are you?' and 'who is the prime minister?' Thanks to advances in science, the disease can now be detected with a simple blood test, while complex computer programmes can determine whether lapses in memory are caused by normal forgetfulness or signal the onset of dementia.
"I am shocked some people are allowed to deteriorate so much and then finally someone figures out that they probably have Alzheimer's disease and takes them to the GP and psychiatrist. By that time the drugs don't work as effectively. It is tragic."
However, researchers are hopeful that new drugs capable of halting Alzheimer's will be available within five to 10 years – meaning that people who are picked up through screening may not go on to suffer the disease.
Professor Sahakian said these screening tests were now ready to be used and could be making an appearance in GPs surgeries by 2013.
Rebecca Wood, of Alzheimer's Research UK, welcomed further research but cautioned: "It's possible that screening could improve diagnosis rates – however, screening for any disease is controversial. We need more research to assess whether a screening programme could really help, or whether it would produce falsely positive or negative results."