Thyroglobulin(Tg) CLIA kit (Chemiluminescence Immunoassay) is an in vitro diagnostic quantitative test kit. Thyroglobulin is a protein that is produced by the thyroid gland. This helps in the synthesis of the thyroxine and the triiodothyronine. Thyroglobulin concentration in the blood of healthy individuals is usually very low. Thyroglobulin concentration in the blood increases in both benign and malignant cases.