Analysis of neurofilament light chain has been found to have 87% sensitivity and 90% specificity in differentiating between primary psychiatric disorders and dementia in younger people,42 and this can also be replicated with plasma biomarkers of neurofilament light chain, p‐tau 181, p‐tau 217, glial fibrillary acidic protein, Aβ40 and Aβ42,43 potentially improving accessibility. The gene discussed is MAPT; the disease is dementia.