Tg generally refers to thyroglobulin, which can be used to identify the structural integrity of the thyroid gland and aid in the diagnosis of thyroid cancer. Thyroglobulin (Tg) is a soluble iodinated glycoprotein synthesized and secreted by the epithelial cells of the thyroid gland, which is secreted into the bloodstream under pathological conditions to induce the production of TgAb. TgAb binds to thyroglobulin and leads to the destruction of thyroid cells. Clinically, thyroglobulin can be used to identify the structural integrity of the thyroid gland and the presence of defects. It is of high significance in the detection of patients with congenital thyroid defects. In addition, thyroglobulin can be used as a tumor marker for differentiated thyroid cancer. By determining its level, it can be used to diagnose the recurrence and metastasis of differentiated thyroid cancer, with high sensitivity and specificity. For more information, please consult your doctor.