two wings (lobes) attached to one another by a middle part called the isthmus.
The thyroid uses iodine, a mineral found in some foods and in iodized salt, to make its hormones. The two most important thyroid hormones are thyroxine (T4) and triiodothyronine (T3). Thyroid stimulating hormone (TSH), which is produced by the pituitary gland, acts to stimulate hormone production by the thyroid gland. The thyroid gland also makes the hormone calcitonin, which is involved in calcium metabolism and stimulating bone cells to add calcium to bone.
See also Calcitonin; Hyperthyroid; Hypothyroidism; Thyroid stimulating hormone; Thyroxine; Triiodothyronine.
- 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 front of the trachea.
Transforming growth factor.
1. Transient global amnesia. 2. Transposition of the great arteries.
- 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 biosynthesis of thyroid hormones. Autoantibodies to thyroid peroxidase (abbreviated […]
- Thyroid scan
An image taken of a patient’s thyroid gland after the patient swallows radioactive iodine or technetium. The image shows the thyroid gland in action as it accumulates radioactive material. Thyroid scanning is used to determine how active thyroid tissue is in manufacturing thyroid hormone. This can help a physician determine whether inflammation of the thyroid […]