What is the role of genetic testing in the diagnosis of celiac disease?

Updated: Oct 10, 2018
  • Author: Stephan U Goebel, MD; Chief Editor: BS Anand, MD  more...
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Genetic testing with confirmatory serology may streamline the diagnosis of celiac disease. In a study that included 1494 women and 1540 men from the general Australian population, along with 356 volunteers who had biopsy-confirmed celiac disease, Anderson et al assessed the ability of HLA-DQ genotyping and serology to estimate the prevalence of celiac disease. [16, 17] Of those with biopsy-confirmed celiac disease, 91.3% had HLA-DQ2.5, 5.3% had HLA-DQ8 but not HLA-DQ2.5, and 2.0% had HLA-DQ2.2 but not HLA-DQ2.5 or HLA-DQ8; 5 patients lacked all 3, but 4 were found to have normal small bowel histology despite prolonged gluten challenge.

The prevalence of celiac disease in the general community, on the basis of the presence of 1 of these HLA-DQ types and positive tissue transglutaminase (TG)-2 serology, was approximately 1.3% in both women and men. [17] Confirmatory testing yielded positive results in 26 subjects (13 women and 13 men) with elevated TG-2 IgA levels, all of whom had HLA-DQ2.5. In addition, test results were positive in all 21 subjects (10 women and 11 men) with raised levels of TG-2 IgA, deamidated gliadin peptide (DGP) IgG, and DGP IgA, all of whom had HLA-DQ2.5. [17]


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