RESUMEN
Clinical features of Iranian children with celiac disease [CD] are still unknown and there is scant information about atypical presentation of celiac disease from Iran. The aim of this study was to determine prevalence of CD in Iranian children presenting with functional abdominal pain [FAP]. In this cross-sectional study, 301 children affected by FAP were screened for CD by anti-tissue transglutaminase antibody [tTG IgA]. IgA antibody was also measured to exclude IgA deficiency. The antibodies were measured by enzyme linked immunosorbent assay. Diagnosis of CD was confirmed by duodenal biopsy that was scored according to the Marsh classification in cases with abnormal titer of tTG antibody. A total of 301 children [138 males, 163 females] with FAP were studied. Endoscopic duodenal biopsy was taken for patients with positive and borderline tTG test. Two out of 301 cases were IgA deficient and celiac disease was suspected for one of them based on histological findings. Four out of 299 patients with normal IgA had abnormal tTG titer; intermediate ranges [16-23 U/ml] were detected in 1 and positive ranges [>/=24 U/ml] in 3 cases. CD was suggested in all patients with abnormal titer of tTG [1.33%] based on histological findings. The prevalence of celiac disease in children with FAP is estimated 1.3% [nearly 2 times higher than in normal population] in Iran