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003444. [edit on Wikidata] Thyroid function tests (TFTs) is a collective term for blood tests used to check the function of the thyroid. [1] TFTs may be requested if a patient is thought to suffer from hyperthyroidism (overactive thyroid) or hypothyroidism (underactive thyroid), or to monitor the effectiveness of either thyroid-suppression or ...
0.3–0.4% (USA) [ 8 ] Hypothyroidism (also called underactive thyroid, low thyroid or hypothyreosis) is a disorder of the endocrine system in which the thyroid gland does not produce enough thyroid hormones. [ 3 ] It can cause a number of symptoms, such as poor ability to tolerate cold, extreme fatigue, muscle aches, constipation, slow heart ...
Thyroid-stimulating hormone (also known as thyrotropin, thyrotropic hormone, or abbreviated TSH) is a pituitary hormone that stimulates the thyroid gland to produce thyroxine (T 4), and then triiodothyronine (T 3) which stimulates the metabolism of almost every tissue in the body. [1] It is a glycoprotein hormone produced by thyrotrope cells in ...
Thyroid disease is a medical condition that affects the function of the thyroid gland. The thyroid gland is located at the front of the neck and produces thyroid hormones [ 1 ] that travel through the blood to help regulate many other organs, meaning that it is an endocrine organ. These hormones normally act in the body to regulate energy use ...
The diagnosis may be suspected based on symptoms and confirmed with blood tests and radioiodine uptake. [1] [4] Typically, blood tests show a raised T 3 and T 4, low TSH, increased radioiodine uptake in all areas of the thyroid, and TSI antibodies. [4] The three treatment options are radioiodine therapy, medications, and thyroid surgery. [1]
Euthyroid sick syndrome (ESS) is a state of adaptation or dysregulation of thyrotropic feedback control [1] wherein the levels of T3 and/or T4 are abnormal, but the thyroid gland does not appear to be dysfunctional. This condition may result from allostatic responses of hypothalamus-pituitary-thyroid feedback control, dyshomeostatic disorders ...
The initial diagnostic evaluation will start with plasma thyroid-stimulating hormone (TSH) concentration. [16] If elevated, it signifies hypothyroidism. [16] The elevation is usually a marked increase over the normal range and is generally greater than 20 mg/dl. [18] Free T4 levels will usually be lowered, but sometimes might be normal. [58]
Thyroid function tests include a battery of blood tests, including the measurement of the thyroid hormones, as well as the measurement of thyroid stimulating hormone (TSH). [84] They may reveal hyperthyroidism (high T 3 and T 4), hypothyroidism (low T 3, T 4), or subclinical hyperthyroidism (normal T 3 and T 4 with a low TSH). [84]
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