These tests help assess the function of your thyroid gland, an important gland that regulates your metabolism.
Thyroid Stimulating Hormone (TSH): This hormone signals the thyroid gland to produce more thyroid hormones. A high TSH level usually indicates an underactive thyroid (hypothyroidism), while a low TSH level may indicate an overactive thyroid (hyperthyroidism). Free Tri-iodothyronine (FT3) and Free Thyroxine (FT4): These are the main thyroid hormones produced by the thyroid gland. Low levels of FT3 and FT4 can indicate hypothyroidism, while high levels can indicate hyperthyroidism. Anti-Thyroglobulin Antibody and Anti-Thyroid Peroxidase Antibody: These antibodies are often tested to help diagnose autoimmune thyroid diseases, such as Hashimoto's disease (hypothyroidism) and Graves' disease (hyperthyroidism).