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Initial levels of TgAb are lower in patients who eventually clear their TgAb (median 4.5, range 1.1 to 108) than in patients whose TgAb persist (median 76, range 12 to 719), although there is substantial overlap between groups. Each TgAb level is normalized and expressed as a fold-change relative to the upper limit of the reference range for the specific TgAb assay by which it was measured.
