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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...

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...

Functions of Thyroid Hormones

Functions of Thyroid Hormones

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...

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...

Hypothyroidism II: Pathophysiology

Hypothyroidism II: Pathophysiology

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...

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...

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Related Experiment Video

Updated: Jun 18, 2026

A Versatile, Behavioral Method to Investigate Thyroid Hormone Effects on Cerebellar Function

A Versatile, Behavioral Method to Investigate Thyroid Hormone Effects on Cerebellar Function

Published on: October 6, 2023

Thyroid function tests: a review.

G Shivaraj¹, B Desai Prakash, V Sonal

¹Department of Biochemistry, J. N. Medical College, Belgaum 590010, Karnataka, India. drshivaraj@yahoo.com

European Review for Medical and Pharmacological Sciences

|December 8, 2009

Summary

This review outlines key thyroid function tests for diagnosing thyroid dysfunction. These tests, including serum markers and imaging, aid in early and accurate detection of thyroid diseases.

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Last Updated: Jun 18, 2026

A Versatile, Behavioral Method to Investigate Thyroid Hormone Effects on Cerebellar Function

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Published on: October 6, 2023

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

Area of Science:

Endocrinology
Diagnostic Medicine
Molecular Biology

Background:

Thyroid dysfunction diagnosis relies on integrating patient history, physical examination, and various diagnostic tests.
Thyroid function tests offer insights at physiological, pathological, and anatomical levels, crucial for understanding thyroid health.

Purpose of the Study:

To provide a comprehensive overview of the diagnostic tests used for thyroid dysfunction.
To highlight the role of various tests in the early and accurate detection of thyroid diseases.

Main Methods:

Review of established and emerging diagnostic modalities for thyroid dysfunction.
Categorization of tests into serum tests (e.g., T4, T3, TSH), serological tests (e.g., ATA, AMA), imaging (ultrasonography, MRI, PET), fine needle aspiration cytology (FNAC), molecular studies, and in vivo tests (radioiodine uptake).

Main Results:

Thyroid function tests encompass a wide range of analyses, from basic hormone levels to advanced molecular markers.
These tests, when combined, offer high sensitivity and specificity for early diagnosis, even with subtle clinical signs.
Diagnostic approaches include biochemical assays, immunological markers, histological examination, imaging, and functional uptake studies.

Conclusions:

A multi-faceted approach utilizing diverse thyroid function tests is essential for accurate diagnosis and management of thyroid disorders.
The integration of various diagnostic methods, including novel molecular studies, enhances the potential for early and precise identification of thyroid pathologies.
Continued advancements in diagnostic technologies promise improved outcomes in managing thyroid diseases.