A blood test to diagnose the Alzheimer's disease may soon be a possibility. An experimental blood test has yielded accurate results in differentiating people with dementia from those without it. Latest trial results showed 89% to 98% accuracy, but larger trials are still required to ascertain the findings. The results were discussed online at the Alzheimer's Association International Conference. Currently, the disease is diagnosed through tests of thinking skills and memory. Other tests like spinal fluid or brain scans are either expensive or invasive. This finding focuses on the protein called 'tau' and finds that one of its forms is a reliable indicator. The study was sponsored by US National Institutes of Health, Swedish government health groups, and the Alzheimer’s Association among other companies and foundations.