<<Disclaimer: Verify this information before applying it to your situation.>>
 
There are basically three serum antibody tests that help towards the
diagnosis of celiac disease.  The specificity and sensitivity of these tests
varies depending upon the test method and the skills of the laboratory
performing the test.  These tests will become negative in CD patients who are
on gluten free diet.
 
Our laboratory specializes in these and experience indicates that one month
or longer on a gluten-containing diet should yield positive results in celiac
patients.
 
Vijay Kumar, Ph.D., F.A.C.B.
IMMCO Diagnostics, Inc.
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1-800-537-TEST