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Thanks so much for your thoughtful reply, it was very helpful. It seems so odd that he would have a negative tTG IgA when he is not IgA deficient and still have Celiac...but you're right, it is hard to come up with another explanation for the very high tTG IgG. Thank you again.

Thanks for that idea. The hematologist works at a clinic affiliated with Stanford, so maybe he could also check with one of the celiac specialists there.

Hi everyone, I am brand new to the board. My son, Stephen, had some very conflicting results in his recent Celiac panel: Immunoglobin A, QN, serum: 203 (range 91-414) Deamidated gliadin ABS, IGA: Negative Deamidated gliadin, ABS, IGG: Negative TTG IGA: Negative 2 (Negative is 0-3) TTG IGG: Strongly positive >100 (Positive is >9) ...