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International initiative for harmonization of cerebrospinal fluid diagnostic comments in Alzheimer's disease

The quantification of cerebrospinal fluid (CSF) biomarkers (Abeta peptides [Ab1‐40 and Ab1‐42], tau protein and its phosphorylated form phospho‐tau) is progressively implemented in laboratories as an aid for the multidisciplinary diagnosis of Alzheimer disease (AD), DeKosky ST, Alz dementia, 2011, PMID: 21322828 . However, no consensus has been defined among the different laboratories involved to adapt the conclusions/comments to the level of quantified CSF biomarkers. As a result, although the analytical methods for such quantification may be similar across the laboratories involved in this clinical task, the conclusions transmitted to the physician in charge (neurologist or psychiatrist) may be quite different. Harmonization of this report is thus necessary so patients’ care and research stratification can be similar wherever the analysis is performed.