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Updated: Jan 22, 2026
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Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
Published on: March 11, 2021
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Optimal levothyroxine dose in post-total thyroidectomy patients: a prediction model for initial dose titration
Saleh F Al-Dhahri1,2, Samiah S Al-Angari3, Jabir Alharbi4
1Department of Otolaryngology - Head and Neck Surgery, College of Medicine, King Saud University, King Abdul Aziz Rd, AlMalaz, Riyadh, 12629, Saudi Arabia.
Summary
Body Surface Area (BSA) predicts levothyroxine (LT4) dosage after total thyroidectomy. Men require higher LT4 doses than women, with BSA being the most significant factor for dose adjustment.
Area of Science:
- Endocrinology
- Thyroid Surgery
- Pharmacology
Background:
- Levothyroxine (LT4) dose titration after total thyroidectomy lacks a consensus.
- Accurate LT4 replacement is crucial for patient outcomes post-thyroidectomy.
Purpose of the Study:
- Identify and quantify predictive factors for optimal LT4 dose replacement.
- Develop a predictive model for LT4 dosage following total thyroidectomy.
Main Methods:
- Retrospective analysis of 234 patients undergoing total thyroidectomy.
- Utilized linear and polynomial regression for prediction.
- Analyzed Body Surface Area (BSA), sex, and diabetes mellitus (DM) status.
Main Results:
- Body Surface Area (BSA) emerged as the most significant predictor of LT4 dose.
- Proposed a BSA-based LT4 dosing model (1.4 µg/kg/day for BSA > 1.79 m², 1.7 µg/kg/day for BSA ≤ 1.79 m²).
- Men required higher LT4 doses than women; DM status and pathology did not influence dosage.
Conclusions:
- BSA is an independent predictor of LT4 dose post-thyroidectomy.
- Current predictive models for LT4 dosage show limited clinical efficiency.
- Further research is needed for practical and clinically relevant prediction models.
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