A new blood test may predict Alzheimer’s risk. It isn’t ready for prime time

By Sandee LaMotte, CNN (CNN) — Cognitively healthy older adults with high levels of a biomarker called p-tau217 in their blood had an estimated 38% greater chance of developing early signs of dementia over five years, a new study found. Over 10 years, the risk was 78% higher, although the data was not as robust.