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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «T»:

  1. Thyroid hormone Thyroid hormone
    Thyroid hormone: A chemical substance made by the thyroid gland for export into the bloodstream. The thyroid gland needs iodine to make thyroid hormones. The two most important thyroid hormones are thyroxine (T4) and triiodothyronine (T3). The thyroid gland is located in front of the neck just in f...
  2. Thyroid hormone organification defect IIb Thyroid hormone organification defect IIb
    Thyroid hormone organification defect IIb: See Pendred syndrome....
  3. Thyroid hormone receptor Thyroid hormone receptor
    Thyroid hormone receptor: A molecule that receives a thyroid hormone and permits it to dock on the nuclear membrane of a cell. The thyroid hormone receptors (THRs) belong to a family of nuclear receptors that function as hormone-activated transcription factors and act by modulating the expression of...
  4. Thyroid hormones Thyroid hormones
    Thyroid hormones: Chemical substances made by the thyroid gland, which is located in the front of the neck. This gland uses iodine to make thyroid hormones, which are essential for the function of every cell in the body. They help regulate growth and the rate of chemical reactions (metabolism),...
  5. Thyroid insufficiency Thyroid insufficiency
    Thyroid insufficiency: See: Hypothyroidism....
  6. Thyroid peroxidase test Thyroid peroxidase test
    Thyroid peroxidase test: A blood test done to detect autoantibodies directed against thyroid peroxidase (TPO), an enzyme in the thyroid gland that is very important to the production of thyroid hormones. TPO is found in thyroid follicle cells where it catalyzes the iodination of T4 and T3 in the bi...
  7. Thyroid scan Thyroid scan
    Thyroid scan: An image taken of the thyroid gland after radioactive iodine is taken by mouth. The thyroid gland is in front of the neck: Thyroid scanning is a nuclear medicine procedure. As the thyroid gland accumulates radioactive material (usually, radioactive technetium or iodine), the gland...
  8. Thyroid stimulating hormone Thyroid stimulating hormone
    Thyroid stimulating hormone: A hormone produced by the pituitary gland at the base of the brain in response to signals from the hypothalamus gland in the brain. Thyroid stimulating hormone (TSH) promotes the growth of the thyroid gland in the neck and stimulates it to produce more thyroid hormones....
  9. Thyroid stimulating immunoglobulin (TSI) Thyroid stimulating immunoglobulin (TSI)
    Thyroid stimulating immunoglobulin (TSI): A form of immunoglobulin G (IgG) that can bind to thyrotropin (TSH) receptors on the thyroid gland. TSIs mimic the action of TSH, causing excess secretion of thyroxine and triiodothyronine. The TSI level is abnormally high in persons with hyperthyroidism...
  10. Thyroid storm Thyroid storm
    Thyroid storm: Thyroid storm is a severe, life-threatening condition caused by an excess of thyroid hormone. A number of factors can be involved in causing thyroid storm, including over-replacement of thyroid hormones or discontinuing medications taken to treat hyperthyroidism. Symptoms of thyroi...
  11. Thyroidectomy Thyroidectomy
    Thyroidectomy: The surgical removal of part or all of the thyroid gland. Subtotal thyroidectomy, the more commonly performed operation, involves removal of only a part of the gland. This procedure may be done to: Remove a tumor from the thyroid, Reduce the mass of a goitrous (enlarged) thyroid g...
  12. Thyroiditis Thyroiditis
    Thyroiditis: Inflammation of the thyroid gland which is located in front of the neck: The inflamed thyroid gland can release an excess of thyroid hormones into the blood stream, resulting in a temporary hyperthyroid state. Once the thyroid gland is depleted of thyroid hormones, the patient commo...
  13. Thyroiditis, autoimmune Thyroiditis, autoimmune
    Thyroiditis, autoimmune: See: Hashimoto thyroiditis....
  14. Thyroiditis, Hashimoto Thyroiditis, Hashimoto
    Thyroiditis, Hashimoto: See: Hashimoto thyroiditis....
  15. Thyroiditis, postpartum Thyroiditis, postpartum
    Thyroiditis, postpartum: Postpartum Thyroiditis is an inflammation of the thyroid gland after pregnancy....