Found it on the Enterolab website under FAQs:
https://www.enterolab.com/StaticPage...rpretation.htm

Quote:

What does it mean that my antigliadin antibody level is just below the upper limit of normal? . . . Although our stool test is multitudes more sensitive in picking up gluten sensitivity than blood tests, no single diagnostic test can rule out gluten sensitivity with 100% certainty (we estimate our antibody test misses about 1 in 500, about equal to the frequency of IgA deficiency in the general population). Thus, while it is very unlikely that a person with an antigliadin antibody level in the normal range has active gluten sensitivity, anyone with symptoms of gluten sensitivity and/or having an autoimmune disease, especially if accompanied by an antibody level just below the cut off, or with a gluten sensitive gene and/or intestinal malabsorption, should consider a 6-12 month trial of a gluten free diet, looking for improvement in symptoms, autoimmune disease severity, and/or intestinal malabsorption. It is only in this population that a gluten free diet should be considered a "trial"; all other people must consider gluten-free diet for positive tests definite and permanent therapy.