TG and differentiated thyroid carcinoma: There was virtually an absence of the thyroid gland in our studied group [patients after thyroidectomy for differentiated thyroid carcinoma (DTC), very low thyroglobulin (Tg) concentration, indicating either no or only a small amount of thyroid tissue] and L-T4 was administrated in constant doses dependent on the risk of DTC recurrence, mostly non-suppressive doses [17].