From The Wall Street Journal:
"The new Alzheimer’s blood tests, meanwhile, are meant to help determine if memory loss and brain aging are due to early stages of the disease. These tests, available with a doctor’s prescription, include one from lab giant Quest Diagnostics Inc. and one developed at Washington University School of Medicine in St. Louis and licensed to C2N Diagnostics, a company founded by some researchers at the university. The tests have been shown to accurately assess whether amyloid plaques have started to accumulate in the brain based on the ratio of levels of two proteins in the blood. "
Read more.