How to tell if you have celiac disease?

Blood test, scope . Screening blood tests can be ordered by your health care provider: tissue transglutaminase IgA and total iga. If positive, consultation with a GI specialist is needed for biopsy of the small intestine obtained through an upper GI endoscopy. It is important not to go on a gluten free diet before diagnosis is made. Labs and biopsy return to normal on gluten free diet (false negative).
GiM.d. If you have any suspicion better be in good hand i.E a G.I.M.D and get blood test antigliadin antibody ttg and get of gluten ( wheat, rye, oat barley ) and see how you feel its not 100% conclusive finally biopsy migt be needed otherwise malabsoption might occur.