Also, routine blood tests (61.2% vs. 46.6%; p < 0.0001), thyroid function tests (52.0% vs. 40.2%,; p < 0.001), carcinoembryonic antigen (11.3% vs. 6.4%; p < 0.05), serology for celiac disease (19.1% vs. 13.2%; p < 0.05); and stool culture and test for ova and parasites (9.7% vs. 4.2%; p < 0.005) were requested more often at first evaluation than at follow-up. The gene discussed is CEACAM5; the disease is celiac disease.