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thyroid function test

ABBR: TFT. Any of several tests for evidence of increased or decreased thyroid function, including a clinical physical examination, which is usually reliable, and a variety of reliable laboratory tests. The most common test to assess thyroid function is the measurement of thyroid-stimulating hormone (TSH) with supersensitive assays. Usually, TSH levels are high in hypothyroidism and suppressed in hyperthyroidism, although in patients with pituitary masses this pattern may be reversed. Other thyroid function tests include measurements of free and total thyroxine (T4) and triiodothyronine (T3), tests of thyroid-binding globulin levels, antithyroid antibody tests, and thyroid gland radioactive iodine uptake (RAIU) measurement. Many of these test results are more difficult to interpret than are TSH results because their normal ranges may vary with pregnancy, liver disease, nutritional status, and other medical conditions. SEE: hyperthyroidism; hypothyroidism.


(thī″royd″īt′ĭs) [thyroid + -itis] Inflammation of the thyroid gland.

chronic lymphocytic t. Hashimoto thyroiditis.

giant cell t. Subacute t.

Hashimoto t. SEE: Hashimoto thyroiditis.

postpartum t. Subacute thyroiditis that may occur up to 12 months after childbirth. It typically consists of three phases: a hyperthyroid phase, transient hypothyroidism, and a return to normal thyroid function.

Riedel t. SEE: under Riedel, Bernhard M. K. L.

subacute t. A relatively rare, self-limiting inflammation of the thyroid gland, characterized by anterior neck pain, thyroid gland tenderness, painful swallowing and/or hoarseness, and transient fluctuations in thyroid function. It often follows an upper respiratory illness and usually resolves in several months. SYN: de Quervain thyroiditis; giant cell thyroiditis; subacute granulomatous thyroiditis.

subacute granulomatous t. Subacute t.


(thī″rō-mĕg′ă-lē) [″ + megas, large] Enlargement of the thyroid gland.


(thī″rō-par″ă-thī″royd″ek′tŏ-mē) [thyro- + parathyroidectomy] Surgical removal of the thyroid and parathyroid glands. SEE: parathyroidectomy; thyroidectomy.


(thī″rō-plăs′tē) Surgery to alter the configuration of the thyroid cartilage adjacent to the vocal cords. This is done to treat certain types of dysphonia. SYN: laryngeal framework surgery.


(thī-rŏt′ō-mē) 1. The splitting of the thyroid cartilage anteriorly in midline to expose laryngeal structures. 2. Surgery on the thyroid gland.


(thī″rō-tŏks′ĭk) [thyro- + toxic] Pert. to excess circulating thyroid hormone.


(thī″rō-tok″sĭ-kō′sĭs) [thyro- + toxicosis] Hyperthyroidism.


(thī′ră-trōf″) Thyroid hormone producing. The term is usually used to denote cells or adenomas in the pituitary gland that secrete thyroid-stimulating hormone.



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