<<Disclaimer:  Verify this information before applying it to your situation.>>

In our experience antibody tests can have both false positives and false
negatives.  That means that you cannot fully depend on them to make the
diagnosis.  If all the antibodies ( Iga gliadin IgG gliadin and IgA
endomysial are positive then it is likely that the person has celiac
disease.  But that is not always the case.  The tests are not
standardised either in the lab methods or in interpretation.  The normal
values vary from age and population.  Joe Murray