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Intra- and inter-assay CVs, respectively, were 2.0% and 3.9% for Aβ42, 3.3% and 8.1% for T-tau and 1.6% and 5.1% for P-tau.
Longitudinal stability in the measurements is further monitored in the laboratory by participation in the Alzheimer’s Association Quality Control program.
Quantitative mass spectrometry-based metabolomic profiling was performed using the Biocrates Absolute IDQ p180 (BIOCRATES, Life Science AG, Innsbruck, Austria).
There Aβ42, T-tau and P-tau were analysed by a single, trained, technician, blinded to the clinical data, using the INNOTEST β-amyloid (1–42), h Tau Ag and Phospho-tau (181 P) ELISA kits respectively (Fujirebio, Ghent, Belgium) run on a FLUOstar Omega BMG LABTECH instrument (chemiluminescent plate reader) according to the manufacturer’s protocols.Exclusion criteria included a pre-existing diagnosis of dementia or other neurodegenerative condition.Between March 2012 and October 2014, 315 participants completed the study. American Society of Anesthesiologists (ASA) physical status classification was available for 53 of the 54 participants.Samples were thawed at 21 °C in an air-conditioned lab and vortexed prior to use.
CSF biomarker values were determined using Omega software (version 5.10 R2) and a 4-parameter curve fit.
DNA samples were processed according to the manufacturer’s instructions (Taq Man Single Nucleotide Polymorphism Genotyping Assay; Life Technologies; Catalogue No. DNA was analysed using the Taq Man Single Nucleotide Polymorphism Genotyping Assay (Life Technologies; Catalogue No. APOE status was inferred from the genotype at each of the two alleles, rs7412 and rs429358.