Thyroglobulin (Tg) Testing. Thyroglobulin (Tg) is a glycosylated protein, produced by the follicles of the thyroid gland. It is produced only in the thyroid tissues of the body. A test of thyroglobulin is thus helpful in understanding thyroid conditions.
What is the normal level of thyroglobulin?
The reference range of thyroglobulin in euthyroid persons without thyroglobulin antibody (TgAb) using CRM-457 standards is 3-40 ng/mL in countries with adequate iodide intake. In about 8% of the general population, thyroglobulin values are less than 10 ng/mL.