Endoscopy was not performed because Pediatric Gastroenterology believed that there was sufficient evidence to support a diagnosis of celiac disease with presentation, lab values, and positive tTG-IgA in our patient, which was 10 times the upper limit of normal. A week after discharge [see Figure 2], the patient was on calcium carbonate 35 mg/kg/day (elemental) divided three times a day. The gene discussed is CD79A; the disease is celiac disease.