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Antibodies Against Deamidated Gliadin Peptides and Tissue Transglutaminase for Diagnosis of Pediatric Celiac Disease - Diagnostic Performance and Cost in Clinical Practice.

By Ola Olen, Audur H Gudjónsdóttir, Lars Browaldh, Mozaffar Hessami, Kerstin Elvin, Ann-Sofie Liedberg, Martin Neovius and Lena Grahnquist

Abstract

OBJECTIVES: To evaluate diagnostic performance and actual costs in clinical practice of IgG/IgA deamidated gliadin peptide antibodies (DGP) as a complement to IgA antibodies against tissue transglutaminase (tTG) for the diagnosis of pediatric celiac disease (CD). PATIENTS AND METHODS: All consecutive patients <18 years tested for tTG and/or DGP and who underwent duodenal biopsy because of suspected CD in Stockholm and Gothenburg, Sweden, 2008-2010 were included. Medical records were reviewed. RESULTS: Of 537 children who underwent duodenal biopsy, 278(52%) had CD. 71(13%) were <2 years and 13(4%) had IgA deficiency. Sensitivity and specificity for tTG was 94% and 86% respectively. Corresponding values for DGP was 91% and 26%. Positive predictive values (PPV) were 88% for tTG and 51% for DGP. There were 148 children who were tTG negative and DGP positive, of which only 5%(8/148) had villous atrophy. Among children <2 years with normal IgA, PPV was 96%(25/26) for tTG and 48%(24/50) for DGP. In 13 IgA deficient children 9 were DGP positive of which 4 had CD (PPV 44%). 8/278 cases of CD would possibly have been missed without DGP. The cost of adding DGP and consequently more biopsies to be able to detect 8 extra cases of CD was &OV0556;399,520 or &OV0556;49,940 per case. CONCLUSION: For diagnosing CD, tTG is superior to DGP, even in children <2 years. Combining tTG and DGP does not provide a better trade off between number of missed cases of CD, number of unnecessary duodenal biopsies and cost than tTG alone

Topics: Pediatrics
Publisher: 'Ovid Technologies (Wolters Kluwer Health)'
Year: 2012
DOI identifier: 10.1097/MPG.0b013e3182645c54
OAI identifier: oai:lup.lub.lu.se:a57c35f2-d537-434f-bb43-0eca7665a854
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