A new line of research is opening very different scenarios: a single drop of blood might be enough to obtain precise information on the disease Diagnosing Alzheimer’s has never been simple. Until today, to have a reliable confirmation of the disease, it is often necessary to resort to expensive or invasive tests, such as PET brain scans or the withdrawal of cerebrospinal fluid through a lumbar puncture. Effective procedures, certainly, but not always easily accessible or acce