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Related Concept Videos

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 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...
Drug Dosing: Obese Patients01:21

Drug Dosing: Obese Patients

In the United States, obesity is a prominent concern. It is linked to heightened mortality rates due to increased occurrences of conditions such as hypertension, atherosclerosis, coronary artery disease, and diabetes compared to nonobese individuals. A patient is classified as obese if their actual body weight surpasses the ideal or desirable body weight by 20%, based on Metropolitan Life Insurance Company data. Ideal body weights consider average weights and heights for males and females...
Hypothyroidism II: Pathophysiology01:23

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...
Functions of Thyroid Hormones01:18

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: 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...

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Related Experiment Video

Updated: May 15, 2026

Transoral Endoscopic Thyroidectomy Vestibular Approach for Thyroid Lobectomy
05:12

Transoral Endoscopic Thyroidectomy Vestibular Approach for Thyroid Lobectomy

Published on: May 12, 2023

Using body mass index to predict optimal thyroid dosing after thyroidectomy.

Kristin A Ojomo1, David F Schneider, Alexandra E Reiher

  • 1Section of Endocrine Surgery, Department of Surgery, University of Wisconsin, Madison, WI 53792, USA.

Journal of the American College of Surgeons
|January 16, 2013
PubMed
Summary

Current weight-based thyroid hormone dosing is inaccurate for many patients. A new formula using body mass index (BMI) offers a more precise method for determining initial levothyroxine doses, improving euthyroid outcomes.

Related Experiment Videos

Last Updated: May 15, 2026

Transoral Endoscopic Thyroidectomy Vestibular Approach for Thyroid Lobectomy
05:12

Transoral Endoscopic Thyroidectomy Vestibular Approach for Thyroid Lobectomy

Published on: May 12, 2023

Area of Science:

  • Endocrinology
  • Thyroidology
  • Pharmacology

Background:

  • Current postoperative thyroid hormone replacement relies on weight-based dosing, leading to delays in achieving euthyroidism.
  • This standard method often results in inaccurate dosing for underweight and overweight individuals.
  • A novel approach utilizing patient body mass index (BMI) data is proposed for improved accuracy.

Purpose of the Study:

  • To develop and validate an accurate method for postoperative thyroid hormone replacement dosing.
  • To investigate the relationship between patient body mass index (BMI) and required levothyroxine dosage.
  • To establish a predictive formula for initial levothyroxine dose based on BMI.

Main Methods:

  • Retrospective analysis of a prospectively collected thyroid database.
  • Inclusion of adult patients who underwent thyroidectomy for benign pathology and achieved euthyroidism.
  • Regression analysis to model the relationship between BMI and euthyroid levothyroxine dose.

Main Results:

  • A quadratic relationship was observed between BMI and euthyroid dose, with a linear trend up to BMI 50.
  • A significant percentage of patients were under- or overdosed with the traditional weight-based method (46% <25 kg/m², 53% >30 kg/m²).
  • A regression equation was derived: Levothyroxine dose (μg/kg/d) = -0.018 × BMI + 2.13, with high statistical significance (F=52.7).

Conclusions:

  • Weight-based thyroid hormone dosing is suboptimal for many patients.
  • Body mass index (BMI) provides a more accurate basis for initial levothyroxine dosing.
  • A simple formula using BMI can enhance the precision of thyroid hormone replacement therapy.