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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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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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Hypothyroidism is a disorder characterized by insufficient production of thyroid hormones, which regulate metabolism, energy balance, and multiple organ systems.TypesHypothyroidism is classified based on the level of dysfunction. Primary hypothyroidism results from intrinsic thyroid gland dysfunction, causing reduced hormone production despite normal or increased stimulation. Secondary hypothyroidism arises from inadequate thyroid-stimulating hormone (TSH) secretion by the pituitary. Tertiary...
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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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The thyroid hormone (TH) plays a pivotal role in the intricate orchestration of physiological processes, exerting profound effects on development, metabolism, and homeostasis throughout different life stages.
TH is indispensable for the normal development and maturation of the skeletal, muscular, and nervous systems during fetal and childhood growth. It facilitates bone mineral turnover and regulates protein synthesis in developing tissues, contributing significantly to overall growth and...
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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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Reference range for thyrotropin. Post hoc assessment.

Rolf Larisch1, A Giacobino, W Eckl

  • 1Prof. Dr. Rolf Larisch, Department of Nuclear Medicine, Klinikum Luedenscheid, Paulmannshoeher Str 14, 58515 Luedenscheid, Germany,

Nuklearmedizin. Nuclear Medicine
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PubMed
Summary
This summary is machine-generated.

Determining the correct thyrotropin (TSH) reference range is crucial for diagnosing thyroid dysfunction. A new indirect method provides accurate TSH reference limits, improving diagnostic accuracy and patient care.

Keywords:
TSHreference rangethyroid hormones

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Area of Science:

  • Endocrinology
  • Clinical Chemistry

Background:

  • The established reference range for thyrotropin (TSH) is subject to ongoing debate.
  • Accurate TSH levels are vital for diagnosing thyroid disorders.

Purpose of the Study:

  • To establish a reliable TSH reference range using an indirect, post hoc method.
  • To assess the accuracy of TSH reference limits in a large, well-characterized population.

Main Methods:

  • An indirect method (Katayev et al.) was employed on 399 subjects without thyroid dysfunction.
  • TSH reference limits were defined using cumulative frequency plots and logarithmic TSH values.
  • Biological variation was assessed using reference change values (RCVs) in 65 subjects.

Main Results:

  • The novel indirect technique yielded TSH reference intervals closely matching conventional limits.
  • Significant discrepancies were observed when compared to previously recommended TSH ranges.
  • The method demonstrated agreement with established limits but differed from earlier suggestions.

Conclusions:

  • Relying on unverified TSH recommendations may lead to missed diagnoses of subclinical thyroid dysfunction.
  • The indirect post hoc verification of TSH reference intervals is a modern, effective approach.
  • This method is valuable for evaluating the performance of existing TSH reference limits, encouraging broader re-evaluation.