A new strategy to estimate levothyroxine requirement after total thyroidectomy for benign thyroid disease
Abstract
BACKGROUND: The current approach for calculating the starting dose of levothyroxine (LT4) after total thyroidectomy is based on the patient's body weight (BW). The aim of the study was to identify the major predictive factors of LT4 requirement and to elaborate a new method to improve the accuracy of the LT4 starting dose after total thyroidectomy. METHODS: The study consists of two parts. The first part consisted of the retrospective identification of 92 adult patients (retrospective cohort) who had undergone a total thyroidectomy for benign disease and who had begun LT4 treatment at a dose of 1.6 μg/kg/day. Adjustments to optimize the LT4 dose were then performed at the post-surgery follow-up on the basis of serum thyrotropin (TSH) levels. The results of this retrospective analysis were used to formulate a nomogram for a proper calculation of the LT4 starting dose that was then used prospectively in the second part of the study on 31 consecutive patients (prospective cohort). RESULTS: At the first follow-up, 37 (40%) patients from the retrospective cohort were euthyroid. Univariate analysis indicated significant correlations between the optimal dose of LT4 and BW, body mass index (BMI), age, preoperative mean corpuscular volume, and free triiodothyronine (fT3). The optimal dose of LT4, analyzed for BMI and age, showed an inverse relationship with these two parameters, and ranged from 1.4 to 1.8 μg/kg/day. In the prospective cohort, the use of an age- and BMI-related nomogram improved the prediction of the optimal LT4 starting dose, with 68% of patients being euthyroid at the first follow-up compared to 41% of patients reported to have reached euthyroid state using the best strategy proposed in the literature. CONCLUSIONS: This study confirms that BW is not the only variable for predicting LT4 requirement, as it decreases with the increase in age and BMI, probably due to the relative decrease of lean body mass. A new correlation between optimal dose and presurgical levels of fT3 and mean corpuscular volume was observed. We propose an easy and more efficient method of calculating LT4 starting dose after total thyroidectomy for benign disease.
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Upon normalization by body weight, the requirement of levothyroxine seemed to be lower than in non-obese subjects.
“Upon normalization by body weight, the requirement of levothyroxine seemed to be lower than in the non-obese subjects (99).”
From ETA guidelines for the use of levothyroxine sodium preparations in monotherapy to optimize the treatment of hypothyroidism (2025) · cites this paper as [99]
The appropriate dosing of L-thyroxine varies with patient body mass index and the percentage of levothyroxine absorbed from the gut.
“The appropriate dosing of L-thyroxine will vary with patient body mass index (219), and the percentage of levothyroxine absorbed from the gut.”
From 2016 American Thyroid Association Guidelines for Diagnosis and Management of Hyperthyroidism and Other Causes of Thyrotoxicosis (2016) · cites this paper as [219]
The appropriate dosing of L-thyroxine will vary with patient body mass index.
“The appropriate dosing of L-thyroxine will vary with patient body mass index (219).”
From 2016 American Thyroid Association Guidelines for Diagnosis and Management of Hyperthyroidism and Other Causes of Thyrotoxicosis (2016) · cites this paper as [219]
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- Authors
- Di Donna, V., Santoro, M. G., de Waure, C., Ricciato, M. P., Paragliola, R. M., Pontecorvi, A., & Corsello, S. M.
- Affiliations
- Università Cattolica del Sacro Cuore
- Università Cattolica del Sacro Cuore (IT)
- Corresponding author
- Pontecorvi, Alfredo
- Venue
- Thyroid
- Publisher
- SAGE Publications
- Published
- 2014-12
- Volume
- 24
- Issue
- 12
- Pages
- 1759-1764
- ISSN
- 1050-7256 (ISSN-L)
- 1557-9077
- OpenAlex
- W1978857002
- Cited by
- 52
- References
- 32
- Citations by year
- 2026: 4 · 2025: 7 · 2024: 4 · 2023: 6 · 2022: 3 · 2021: 6 · 2020: 5 · 2019: 4 · 2018: 2 · 2017: 1 · 2016: 4 · 2015: 6
- FWCI
- 3.64
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Thyroid (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Surgery › Thyroid and Parathyroid Surgery
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Disorders and Treatments
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Cancer Diagnosis and Treatment
- Keywords
- levothyroxine dose, total thyroidectomy, benign thyroid disease, nomogram, body mass index, age, free triiodothyronine, mean corpuscular volume, serum TSH, euthyroidism, lean body mass
- MeSH terms
- Adult, Aged, Body Weight, Female, Humans, Male, Middle Aged, Prospective Studies, Retrospective Studies, Thyroid Diseases, Thyroidectomy, Thyroxine, Hormone Replacement Therapy
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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