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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...
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...
Hyperthyroidism II: Pathophysiology01:27

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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 receptors...
Graves Disease II: Pathophysiology01:24

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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, and heat...
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The basal dose constitutes about 40%-50% of the total daily dose, with the rest as premeal insulin. The mealtime insulin dose should mirror...

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Related Experiment Video

Updated: May 14, 2026

Mixed Reality Assisted Radical Endoscopic Thyroidectomy
08:06

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Published on: January 31, 2025

Levothyroxine replacement dosage determination after thyroidectomy.

Judy Jin1, Matthew T Allemang, Christopher R McHenry

  • 1Department of Endocrine Surgery, Endocrine & Metabolism Institute, Cleveland Clinic, Cleveland, OH, USA.

American Journal of Surgery
|February 2, 2013
PubMed
Summary
This summary is machine-generated.

Calculating levothyroxine doses after thyroidectomy is simplified using a weight-based formula. This approach provides the best estimation for effective levothyroxine replacement therapy in postsurgical hypothyroidism patients.

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Area of Science:

  • Endocrinology
  • Thyroid Surgery
  • Pharmacology

Background:

  • Post-thyroidectomy hypothyroidism requires accurate levothyroxine (LT4) dosing.
  • Current methods for calculating LT4 doses can be complex.

Purpose of the Study:

  • To identify a simple and effective method for calculating LT4 doses in patients after thyroidectomy.
  • To evaluate the efficacy of weight-based LT4 dosing compared to other patient factors.

Main Methods:

  • A weight-based formula (μg/kg) was used to calculate initial LT4 doses for 404 patients undergoing thyroidectomy for benign disease (2001-2011).
  • Formulas incorporating age, sex, ideal body weight, BMI, and BSA were also assessed.
  • Thyroid-stimulating hormone (TSH) levels were monitored to assess dose efficacy.

Main Results:

  • The mean initial LT4 dose was 1.4 μg/kg, achieving TSH normalization in 59% of patients.
  • Adjusted mean therapeutic doses were 1.5 μg/kg after total thyroidectomy and 1.3 μg/kg after lobectomy.
  • A regression model including additional patient factors did not improve dosing reliability.

Conclusions:

  • A weight-based LT4 dosage calculation of 1.5 μg/kg for total thyroidectomy and 1.3 μg/kg for lobectomy is the most reliable method.
  • This simple, weight-based approach is recommended for levothyroxine replacement therapy post-thyroidectomy.