MAPT and Alzheimer disease: Lumbar punctures are commonly utilized in the identification of cerebrospinal fluid (CSF) biomarkers for AD, including beta‐amyloid 42, tau, and phospho‐tau.[6, 7] Blood tests represent an additional modality for the diagnosis of AD, with the primary objective of detecting brain‐derived biomarker proteins such as beta‐amyloid 42/beta‐amyloid 40 and phospho‐tau 181.