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Cerebrospinal fuid (CSF) can provide vital informative about pathological processes occurring in the brain. In particular, the CSF concentrations of Aβ42, tTau, and pTau181 are usefulfor the early diagnosis of Alzheimer’s disease (AD). However, many studies have demonstrated that confounding factors related to the preanalytical processing of CSF can seriously infuence measurements of these AD biomarkers. It is therefore important to develop a standardized protocol for the acquisition and handling of CSF, particularly with regard to the types oftube used for collection and storage, the proper aliquot volume, blood contamination, andthe number of tube transfers and freeze-thaw cycles, because these aspects of the procedurehave been shown to afect AD biomarker measurements. A survey of the impact of severalindividual preanalytical procedures on the measurement of AD biomarkers in CSF was conducted for this review article, and the implications of the diferences among them are discussed. Furthermore, following a review of the procedures used in Korean and internationalbiomarker laboratories, a consensus was reached among a cooperative Korean multicenterresearch group regarding a standardized protocol for the analysis of AD biomarkers in CSF. All eforts were made to be stringent regarding the controversial issues associated with thisprotocol, thus minimizing the confounding infuence of various factors on current investigations using established AD biomarkers and on future studies using novel biomarkers of ADand other neurodegenerative disorders.

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