Thyroid autoantibody levels are evaluated to determine the autoimmune background in several thyroid diseases; Tg levels can be used as a marker in the follow-up of patients with DTC who underwent TT after Tg secretion is stimulated by the withdrawal of l-thyroxin postoperative substitution therapy or by rhTSH administration [11, 12]. The gene discussed is TG; the disease is thyroiditis.