BLOOD TEST FOR ALZHEIMER’S DISEASE. PROMISING – BUT. The blood test (for P-Tau 217) examined in this research (https://jamanetwork.com/journals/jama/fullarticle/2768841) appears to distinguish Alzheimer’s disease from other common causes of dementia. That is potentially useful for research and could be practically and clinically useful as well, for at least two reasons: (1) to provide a diagnosis – an explanation for a person experiencing problems with functions such as memory or word-finding. (2) to allow early interventions which could stop or slow…..