I am just now being tested for celiac's disease. My doctor ordered 3 tests - IGA, Serum; Gliadin AB; Tissue Transglutaminase AB IGA. The first and last appear to be within normal limits. However, the middle test, Gliadin AB, was not done as the lab had an "accident" with my specimen. Does anyone know if it would be wise for me to have this test done,...