This add-on measures the level of thyroglobulin antibodies (ATG) in your blood, which are immune proteins that target thyroglobulin—a key protein produced by the thyroid gland. Elevated ATG levels can indicate autoimmune thyroid conditions such as Hashimoto’s thyroiditis or Graves’ disease. Even without obvious symptoms, the presence of these antibodies may suggest early immune activity affecting thyroid function.

Read our complete guide to Thyroglobulin Antibody →