Summary
New blood tests could transform how doctors detect Alzheimer’s disease by measuring amyloid and tau proteins in a simple blood sample. Several tests cleared by the FDA since 2025 can help identify Alzheimer’s-related changes, rule out the disease in some symptomatic patients, or support diagnosis. One test showed a 97.1% positive predictive value compared with established PET and spinal-fluid testing in a memory-clinic population. However, experts caution that these tests do not independently predict Alzheimer’s in healthy people or confirm the disease without symptoms. Kidney problems, medications, and demographic differences can affect results. Researchers say further evidence is needed before routine primary-care screening becomes standard.
Psychology Today
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