Blood Tests for Alzheimer’s Are Here

November 5, 2025

An array of vials from blood tests.

(Wired) – New diagnostic kits aim to revolutionize early screening of the disease, potentially allowing patients to receive treatments—such as monoclonal antibodies—sooner.

Last month, The US Food and Drug Administration approved a new blood test for assisting the diagnosis of Alzheimer’s disease. Produced by Roche, Elecsys pTau181 measures the concentration of a specific molecule—a phosphorylated form of the tau protein—in the blood. Tau is one of two proteins, the other being amyloid, that become malformed and accumulate in the brains of patients with certain types of dementia. It is believed that the buildup of these proteins interferes with the communication of brain cells, leading to these patients’ symptoms. (Read More)