All tests must be performed while a person is on a gluten-containing diet (8-10g/day) for 6 weeks. Liver function tests, Iron studies, Calcium, Vitamin D, Anaemia (iron, B12, folic acid), Antibody test (IgA-tTg, IgG AGA), Anti-TTG, anti-EMA, anti-DGP)- sometimes people have IgA, deficiencies even when they have coeliac, Endoscopy, Bone mineral density scan, Genetic testing (HLA-DQ2, HLA-DQ8), Biopsies of the proximal small bowel (duodenal) are the gold standard