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Hyperthyroidism I: Introduction

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...

Hyperthyroidism II: Pathophysiology

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 II: Pathophysiology

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 Hormones

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...

Goiter

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...

Graves' Disease I: Introduction

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...

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Related Experiment Video

Updated: May 31, 2026

Synchronous Triplanar Reconstruction Integrated with Color Doppler Mapping for Precise and Rapid Localization of Thyroid Lesions

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Published on: February 9, 2024

Unexplained high thyroid stimulating hormone: a "BIG" problem.

Heidi Mendoza¹, Alan Connacher, Rajeev Srivastava

¹Ninewells Hospital and Medical School, Biochemical Medicine, NHS Tayside, Ninewells, Dundee DD1 9SY, UK.

BMJ Case Reports

|June 21, 2011

Summary

Macro-hormones, such as macro-thyroid stimulating hormone (TSH), are high molecular weight complexes that can cause falsely elevated test results. Identifying macro-TSH in a euthyroid patient resolved diagnostic confusion and unnecessary testing.

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Synchronous Triplanar Reconstruction Integrated with Color Doppler Mapping for Precise and Rapid Localization of Thyroid Lesions

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In vivo Characterization of Endocrine Disrupting Chemical Effects via Thyroid Hormone Action Indicator Mouse

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Published on: October 6, 2023

Area of Science:

Endocrinology
Clinical Biochemistry

Background:

Macro-hormones and macro-enzymes are high molecular weight conjugates that can lead to artifactually elevated biochemical test results.
While macro-enzymes like macro-creatine kinase and macro-amylase are well-documented, macro-hormones are less commonly reported, with macro-prolactin being a notable exception.

Purpose of the Study:

To present a case of macro-thyroid stimulating hormone (TSH) causing unexplained elevated TSH levels in a clinically euthyroid patient.
To highlight the diagnostic challenges and resolution following the identification of macro-TSH.

Main Methods:

The study involved a clinically euthyroid patient with persistently elevated TSH and normal free thyroxine levels.
Repeated thyroid investigations and thyroid hormone interference studies were conducted.
Identification and characterization of macro-TSH were performed.

Main Results:

A case of macro-TSH was identified as the cause of persistently elevated TSH in a euthyroid individual.
The identification of macro-TSH resolved diagnostic confusion and led to the cessation of repeated thyroid function tests for the patient.

Conclusions:

Macro-TSH is a significant, albeit uncommon, cause of elevated TSH that can lead to diagnostic uncertainty.
Characterization of such biochemical abnormalities is crucial for appropriate patient management and avoiding unnecessary investigations.