What is a thyroglobulin test?This test measures the level of thyroglobulin in your blood. Thyroglobulin is a protein made by cells in the thyroid. The thyroid is a small, butterfly-shaped gland located near the throat. A thyroglobulin test is mostly used as a tumor marker test to help guide thyroid cancer treatment.Tumor markers, sometimes called cancer markers, are substances made by cancer cells or by normal cells in response to cancer in the body. Thyroglobulin is made by both normal and cancerous thyroid cells.The main goal of thyroid cancer treatment is to get rid of all thyroid cells. It usually involves removing the thyroid gland through surgery, followed by therapy with radioactive iodine (radioiodine). Radioiodine is a medicine used to destroy any thyroid cells that are left after surgery. It is most often given as a liquid or in a capsule.After treatment, there should be little to no thyroglobulin in the blood. Measuring thyroglobulin levels can show whether thyroid cancer cells are still in the body after treatment.Other names: Tg, TGB. thyroglobulin tumor marker
