Loading…

Diagnostic Accuracy of ELISA and xMAP Technology for Analysis of Amyloid [beta]^sub 42^ and Tau Proteins

Cerebrospinal fluid (CSF) concentrations of amyloid β^sub 42^ (Aβ^sub 42^) peptides and tau proteins may serve as biomarkers for Alzheimer disease (AD). Recently, the xMAP technology has been introduced as an alternative to ELISA for measurement of these markers. We used xMAP assays and ELISA to ana...

Full description

Saved in:
Bibliographic Details
Published in:Clinical chemistry (Baltimore, Md.) Md.), 2007-05, Vol.53 (5), p.859
Main Authors: Reijn, Thierry S M, Marcel Olde Rikkert, Wieneke J A van Geel, de Jong, Danielle, Verbeek, Marcel M
Format: Article
Language:English
Subjects:
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Cerebrospinal fluid (CSF) concentrations of amyloid β^sub 42^ (Aβ^sub 42^) peptides and tau proteins may serve as biomarkers for Alzheimer disease (AD). Recently, the xMAP technology has been introduced as an alternative to ELISA for measurement of these markers. We used xMAP assays and ELISA to analyze CSF concentrations of Aβ^sub 42^, total tau (t-tau), and tau phosphorylated at threonine 181 (p-tau^sub 181^) in samples from 69 patients with Alzheimer disease, 26 patients with vascular dementia, and 55 controls without neurological disorders. High CV values (>28%) for the ratio of xMAP: ELISA were observed for each biomarker, indicating that a constant correction factor cannot be applied to recalculate xMAP results into ELISA results. When a combination of CSF markers was used, the sensitivity, specificity, and area under the ROC curves for xMAP assays and ELISAs were not significantly different in differentiating AD patients from vascular dementia patients and controls. A constant conversion factor cannot be used successfully to recalculate results obtained with xMAP assays to those from the ELISAs. With the use of analysis of a combination of Aβ^sub 42^, t-tau, and p-tau in CSF, however, differentiation of clinical groups is equivalent when either xMAP technology or conventional ELISA is used.
ISSN:0009-9147
1530-8561