Celiac.com 11/10/2015 - Doctors might not need a biopsy to accurately diagnose celiac disease in asymptomatic children who have elevated anti-tTG, according to the latest study.
In that study, researchers in Italy evaluated a new biopsy-sparing protocol for diagnosing celiac disease in symptomatic children with high anti-transglutaminase (anti-tTG). Their data showed that this approach might also work in asymptomatic children with elevated antibody levels.
Dr. Francesco Valitutti of Rome's Sapienza University led a team that set out to assess the accuracy of serological tests to diagnose celiac disease in asymptomatic patients in 286 children and adolescents who had been diagnosed with celiac disease.
Among 196 patients with anti-tTG antibodies at least 10 times ULN and EMA positive, 156 had symptoms and 40 were asymptomatic. More than 90% of the symptomatic children (142/156, 91%) showed severe lesion degree on biopsy, and an even higher percentage of asymptomatic patients (37/40, 92.5%) had severe lesions.
There was no significant difference in histological damage between the "high-titer" symptomatic and asymptomatic children, according to the September 15th online report in The American Journal of Gastroenterology. Among the EMA positive children with lower titers of anti-tTG antibodies, 70% of symptomatic children and 81% of asymptomatic children showed severe lesions.
The researchers add that asymptomatic patients should follow a gluten-free diet "as strictly as symptomatic ones, in order to prevent other autoimmune diseases and enteropathy-associated T-cell lymphoma."
Otherwise, the new guidelines apply to patients with: TTG > 10 times ULN; an EMA of at least 1:80; a positive repeat serology to exclude laboratory error; HLA-DQ2 and/or -8 positivity; and a serological response to a gluten-free diet.
If the research team can confirm these results in larger, multi-center prospective studies, their 'biopsy-sparing' protocol might be made available "to both symptomatic and asymptomatic patients with anti-tTG antibody titer (at least) 10 times the upper limit of normal (ULN) and anti-endomysial antibodies (EMA) and HLA-DQ2/DQ8 positive," Dr. Valitutti told reporters.