Human Thyroglobulin (Tg) is a 660kD, dimeric protein produced by and used entirely within the thyroid gland. Human Thyroglobulin Tg was referred to as "colloid”. Human Thyroglobulin (Tg) is used by the thyroid gland to produce the thyroid hormones thyroxine (T4) and triiodothyronine.||Patients with Hashimoto's thyroiditis or Graves' disease, frequently develop antibodies against human Thyroglobulin (Tg). Human Thyroglobulin Tg-specific antibodies help in the diagnosis of these diseases, but they also may be present in apparently healthy euthyroid individuals.||Human Thyroglobulin (Tg) levels in the blood can be used as a tumor marker for certain kinds of thyroid cancer. Thyroglobulin (Tg) levels in the blood can also be elevated in cases of Graves disease.||Storage and Stability:|Lyophilized and reconstituted products are stable for 6 months after receipt at -20°C. Reconstitute with sterile PBS. Aliquot to avoid repeated freezing and thawing. Store at -20°C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.