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Related Concept Videos

Hyperthyroidism I: Introduction01:25

Hyperthyroidism I: Introduction

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...
Graves Disease II: Pathophysiology01:24

Graves Disease II: Pathophysiology

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, and heat...
Synthesis and Regulation of Thyroid Hormones01:20

Synthesis and Regulation of Thyroid Hormones

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.
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The iodine is then...
Hyperthyroidism II: Pathophysiology01:27

Hyperthyroidism II: Pathophysiology

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 receptors...
Graves' Disease I: Introduction01:28

Graves' Disease I: Introduction

Graves' disease is an autoimmune disorder that causes hyperthyroidism, or overactivity of the thyroid gland. It results from autoantibodies called thyroid-stimulating immunoglobulins (TSIs), which bind to thyroid-stimulating hormone (TSH) receptors, leading to overstimulation of hormone production and a hypermetabolic state.EtiologyAlthough considered idiopathic, Graves’ disease has well-established contributing factors. There is a strong genetic component, with increased prevalence in...
Goiter01:27

Goiter

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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Related Experiment Video

Updated: Jun 2, 2026

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
04:39

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

Published on: March 17, 2023

Serum myoglobin in patients with thyroid dysfunction.

Waad-Allah S Mula-Abed1, Sawsan S Al-Sinani, Huda S Al-Hashmi

  • 1Department of Chemical Pathology, Royal Hospital, Muscat, Sultanate of Oman.

Sultan Qaboos University Medical Journal
|April 22, 2011
PubMed
Summary
This summary is machine-generated.

Serum myoglobin levels are elevated in hypothyroidism, suggesting it as a potential diagnostic indicator. This finding aids in diagnosing thyroid dysfunction and understanding myoglobin changes.

Keywords:
HypothyroidismMyoglobin

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Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
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10:12

A Sensitive and Specific Quantitation Method for Determination of Serum Cardiac Myosin Binding Protein-C by Electrochemiluminescence Immunoassay

Published on: August 8, 2013

Area of Science:

  • Endocrinology and Metabolism
  • Clinical Biochemistry

Background:

  • Thyroid dysfunction, encompassing hypothyroidism and hyperthyroidism, affects numerous bodily functions.
  • Serum myoglobin, a protein found in muscle tissue, has been investigated for its role in various medical conditions.

Purpose of the Study:

  • To investigate the relationship between thyroid dysfunction and serum myoglobin concentration.
  • To determine if serum myoglobin levels differ across hypothyroid, hyperthyroid, and euthyroid individuals.

Main Methods:

  • Serum samples from 150 subjects with suspected thyroid disorders were analyzed.
  • Subjects were categorized into hypothyroid, hyperthyroid, and euthyroid groups based on thyroid-stimulating hormone (TSH) and free thyroxine (FT4) levels.

Main Results:

  • Serum myoglobin was significantly higher in hypothyroid patients (38.5 ± 23.1 μg/L) compared to euthyroid (17.4 ± 5.7 μg/L) and hyperthyroid (18.1 ± 7.0 μg/L) groups.
  • 58% of hypothyroid subjects exhibited elevated serum myoglobin levels.
  • No significant correlation was found between TSH or FT4 and myoglobin levels.

Conclusions:

  • Elevated serum myoglobin may indicate hypothyroidism.
  • Hypothyroidism should be considered in the differential diagnosis for individuals presenting with high serum myoglobin levels.