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Synthesis and Regulation of Thyroid Hormones01:20

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Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
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The thyroid gland is a small, butterfly-shaped gland located in the neck and covers the anterior surface of the trachea. The gland has two lateral lobes connected by a thin tissue mass called the isthmus. Internally, each lobe comprises many small spherical structures known as thyroid follicles, surrounded by a network of blood vessels.
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Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH...
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Graves Disease II: Pathophysiology01:24

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Graves’ disease is an autoimmune disorder characterized by the production of thyroid-stimulating immunoglobulins (TSI) that activate TSH receptors, leading to excessive synthesis and release of thyroid hormones (T3 and T4) and resulting in hyperthyroidism.Among all causes of hyperthyroidism, Graves’ disease is the most common and can happen at any age, though it is more frequent in women. It produces a hypermetabolic state with features such as weight loss, tachycardia, tremor,...
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Hyperthyroidism I: Introduction01:25

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Hyperthyroidism is a type of thyrotoxicosis characterized by the thyroid gland's overproduction of the thyroid hormones triiodothyronine (T3) and thyroxine (T4). This hormone excess increases the basal metabolic rate and enhances sensitivity to catecholamines.DiagnosisDiagnosis is based on clinical features and biochemical testing. It typically shows suppressed thyroid-stimulating hormone (TSH) levels below 0.4 mIU/L, with elevated free T3 and/or T4. Additional tests, including thyroid...
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Goiter

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Goiter refers to an abnormal enlargement of the thyroid gland that may appear as a diffuse goiter (uniform enlargement) or nodular (single or multiple nodules). Functionally, it is classified as nontoxic (normal/low hormone levels) or toxic (excess hormone production).PathophysiologyDiffuse thyroid enlargement typically results from prolonged stimulation by thyroid-stimulating hormone (TSH) or TSH-like agents, commonly seen in hypothyroidism or iodine deficiency. In contrast, in hyperthyroid...
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An Ex vivo Culture System to Study Thyroid Development
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Thyroglobulin in differentiated thyroid cancer.

Carol Evans1, Sarah Tennant1, Petros Perros2

  • 1Department of Medical Biochemistry & Immunology, University Hospital of Wales, Heath Park, Cardiff CF14 4XW, UK.

Clinica Chimica Acta; International Journal of Clinical Chemistry
|December 3, 2014
PubMed
Summary
This summary is machine-generated.

Interpreting serum thyroglobulin (Tg) in differentiated thyroid cancer (DTC) patients requires understanding TSH levels and assay limitations. Awareness of Tg heterogeneity and antibody interference is crucial for accurate monitoring.

Keywords:
Differentiated thyroid cancerThyroglobulin

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Area of Science:

  • Endocrinology
  • Oncology
  • Clinical Chemistry

Background:

  • Differentiated thyroid cancer (DTC) diagnosis is increasing, with patients generally having a good prognosis.
  • Standard treatment involves total thyroidectomy, radioiodine ablation, and levothyroxine suppression.
  • Long-term follow-up necessitates serum thyroglobulin (Tg) measurement for monitoring.

Purpose of the Study:

  • To review the interpretation of serum thyroglobulin (Tg) results in differentiated thyroid cancer (DTC) patients.
  • To highlight the importance of considering assay limitations and interfering factors.
  • To guide clinicians in understanding Tg results for effective patient management.

Main Methods:

  • Review of current literature on differentiated thyroid cancer (DTC) follow-up and thyroglobulin (Tg) assays.
  • Analysis of factors affecting Tg measurement accuracy, including TSH dependency and assay interferences.
  • Discussion of clinical relevance of Tg results in the context of assay limitations.

Main Results:

  • Serum Tg measurement is TSH-dependent, requiring concurrent TSH concentration for accurate interpretation.
  • Assay limitations, such as Tg heterogeneity, tumor-secreted Tg forms, and assay biases, impact results.
  • Endogenous thyroglobulin antibodies (TgAbs) can interfere with immunoassay accuracy, leading to potential misinterpretation.

Conclusions:

  • Accurate interpretation of serum Tg in DTC patients demands knowledge of TSH levels and assay limitations.
  • Clinicians must be aware of potential interferences, particularly from thyroglobulin antibodies (TgAbs).
  • Understanding these factors is essential for reliable monitoring and management of differentiated thyroid cancer.