--the test you are referring to is the anti-transglutaminase IgG test (correct me if I'm wrong).

Usually, the celiac panel also includes an anti-transglutaminase IgA test, which according to most of the sources I've seen (you can look these up in The Gluten File at the top of this board or just Google it) is the test most closely associated with the villous atrophy of frank celiac. Did you get that test as well?

Getting a biopsy would be a very personal choice. About twenty percent of people who show definite celiac villous atrophy actually are are NEGATIVE on the IgA anti-transglutaminase test but have other symptoms. What started you on this investigative path originally?

Remember, you don't need anyone's permission to try a gluten-free trial and see how that influences your symptoms.