The Anti-Thyroglobulin (Anti-Tg) Enzyme Immunoassay is a diagnostic test used to measure levels of thyroglobulin antibodies in serum. Thyroglobulin is a protein produced by the thyroid gland, and the presence of anti-Tg antibodies can indicate autoimmune thyroid disorders, such as Hashimoto's thyroiditis or Graves' disease. This assay provides valuable insights into thyroid function and autoimmune activity. Clinicians utilize the Anti-Tg immunoassay to evaluate patients with thyroid dysfunction, monitor treatment responses, and assess the risk of developing thyroid-related complications.