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Contribution of cerebrospinal fluid Alzheimer biomarkers to the diagnosis of Creutzfeldt‐Jakob disease

The definite diagnosis of Creutzfeldt‐Jakob disease (CJD) requires a neuropathological examination revealing the presence of the pathogenic prion protein. As a reliable in vivo diagnosis is required for clinical care, without pathological confirmation, diagnostic criteria for CJD have been proposed including neuroimaging, electrophysiology and 14.3.3 protein positivity in cerebrospinal fluid (CSF) but their accuracy remains suboptimal. Tau protein in cerebrospinal fluid was found to be extremely elevated in CJD and the phosphorylated‐Tau to Tau ratio (P‐Tau/Tau) was reported to be decreased for some CJD patients.