title: Development and validation of dried matrix spot sampling for the quantitative determination of amyloid β peptides in cerebrospinal fluid.
abstract: BACKGROUND
  The use of dried blood spots on filter paper is well documented as an affordable and practical alternative to classical venous sampling for various clinical needs. This technique has indeed many advantages in terms of collection, biological safety, storage, and shipment. Amyloid β (Aβ) peptides are useful cerebrospinal fluid (CSF) biomarkers for Alzheimer disease diagnosis. However, Aβ determination is hindered by preanalytical difficulties in terms of sample collection and stability in tubes.
  
  
  METHODS
  We compared the quantification of Aβ peptides (1-40, 1-42, and 1-38) by simplex and multiplex ELISA, following either a standard operator method (liquid direct quantification) or after spotting CSF onto dried matrix paper card.
  
  
  RESULTS
  The use of dried matrix spot (DMS) overcame preanalytical problems and allowed the determination of Aβ concentrations that were highly commutable (Bland-Altman) with those obtained using CSF in classical tubes. Moreover, we found a positive and significant correlation (r2=0.83, Pearson coefficient p=0.0329) between the two approaches.
  
  
  CONCLUSIONS
  This new DMS method for CSF represents an interesting alternative that increases the quality and efficiency in preanalytics. This should enable the better exploitation of Aβ analytes for Alzheimer's diagnosis.
authors.forename: Constance
authors.initials: C
authors.lastname: Delaby
authors.forename: Audrey
authors.initials: A
authors.lastname: Gabelle
authors.forename: Philippe
authors.initials: P
authors.lastname: Meynier
authors.forename: Vincent
authors.initials: V
authors.lastname: Loubiere
authors.forename: Jérôme
authors.initials: J
authors.lastname: Vialaret
authors.forename: Laurent
authors.initials: L
authors.lastname: Tiers
authors.forename: Jacques
authors.initials: J
authors.lastname: Ducos
authors.forename: Christophe
authors.initials: C
authors.lastname: Hirtz
authors.forename: Sylvain
authors.initials: S
authors.lastname: Lehmann
mesh_terms: D000544:Alzheimer Disease / Q000175:diagnosis; D016229:Amyloid beta-Peptides / Q000134:cerebrospinal fluid*; D015415:Biomarkers / Q000134:cerebrospinal fluid; D059788:Dried Blood Spot Testing; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D010446:Peptide Fragments / Q000134:cerebrospinal fluid*
chemical_list: D016229:Amyloid beta-Peptides; D015415:Biomarkers; D010446:Peptide Fragments; C078639:amyloid beta-protein (1-38); C078592:amyloid beta-protein (1-40); C075222:amyloid beta-protein (1-42)