Combination Testing for Antibodies in the Diagnosis of Coeliac Disease: Comparison of Multiplex Immunoassay and ELISA Methods

Overview

Journal Aliment Pharmacol Ther

Specialties Gastroenterology
Pharmacology

Date 2009 Jan 16

PMID 19145736

Citations 17

Authors

S Rashtak

M W Ettore

H A Homburger

J A Murray

Affiliations

Soon will be listed here.

Abstract

Background: Tissue transglutaminase (TTG) antibodies and newly developed deamidated gliadin peptide (DGP) antibodies have better accuracy than native gliadin antibodies. Multiplex immunoassay (MIA) measures multiple antibodies simultaneously providing a complete antibody phenotype with reduced turnaround time and cost.

Aim: To evaluate the agreement between MIA and enzyme-linked immunosorbent assay (ELISA) test results for coeliac autibodies in biopsy-proven coeliac patients and controls and to model the diagnostic utility of combination testing.

Methods: We compared the sensitivity, specificity and accuracy of MIA and ELISA methods for TTG and DGP antibodies in mainly adult untreated coeliac patients (n = 92) and controls (n = 124).

Results: There was excellent agreement and a significant correlation between the results of MIA and ELISA methods (k > 0.8, r > 0.7) for all tests, except IgG. Diagnostic indices of individual and combination tests measured by the MIA method did not differ significantly from those measured by ELISA. The combination tests slightly increased sensitivity (if any test was positive) and specificity (if all tests were positive) compared to the individual tests.

Conclusions: Multiplex immunoassay testing for antibodies is as accurate as ELISA for coeliac disease diagnosis and has practical advantages over ELISA method. Rational combination testing can help identify patients who need intestinal biopsy and may reduce unnecessary biopsies.

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