Celiac.com 04/06/2012 - The first step in diagnosing celiac is serological testing, looking for the presence of anti-tTg antibodies. But in adults at least a duodenal biopsy is still the gold standard of diagnosis, partially because of the risk of false positive anti-tTg results. Yet serum anti-tTg levels positively correlate with the severity of small intestinal histopathology. This prompted researchers in Italy to wonder if those patients with the highest ant-tTg levels could be spared an endoscopy, and if so, how high their anti-tTg levels had to be. They conclude, in their words, that "tissue-transglutaminase