Title |
Serum Thyrotropin and Phase of the Menstrual Cycle
|
---|---|
Published in |
Frontiers in endocrinology, September 2017
|
DOI | 10.3389/fendo.2017.00250 |
Pubmed ID | |
Authors |
Salvatore Benvenga, Flavia Di Bari, Roberta Granese, Alessandro Antonelli |
Abstract |
About one-fifth of patients treated with levothyroxine have serum thyrotropin (TSH) above target concentrations but, in approximately 15% of them, the cause of this TSH insufficient normalization remains unknown. We report the cases of two regularly menstruating women with known thyroid disease who had TSH levels consistently >3 mU/L (and sometimes above target levels) during mid-cycle, but consistently lower serum levels during the follicular and luteal phases of menstrual cycle. A major TSH release by the thyrotrophs in response to high circulating levels of estradiol (E2) at mid-cycle may increase levels of TSH compared to other phases of the cycle. The increased TSH can be misinterpreted as refractory hypothyroidism if the woman is under L-T4 replacement therapy or as subclinical hypothyroidism if the woman is not. Our findings might have important implications for diagnosis and management of thyroid disease, suggesting to request serum TSH measurements outside of the periovulatory days. |
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Geographical breakdown
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Spain | 5 | 22% |
Argentina | 2 | 9% |
Mexico | 1 | 4% |
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Netherlands | 1 | 4% |
Switzerland | 1 | 4% |
Unknown | 12 | 52% |
Demographic breakdown
Type | Count | As % |
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Members of the public | 23 | 100% |
Mendeley readers
Geographical breakdown
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Unknown | 35 | 100% |
Demographic breakdown
Readers by professional status | Count | As % |
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Student > Bachelor | 4 | 11% |
Student > Doctoral Student | 4 | 11% |
Student > Master | 3 | 9% |
Researcher | 3 | 9% |
Lecturer | 2 | 6% |
Other | 6 | 17% |
Unknown | 13 | 37% |
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Biochemistry, Genetics and Molecular Biology | 2 | 6% |
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Social Sciences | 2 | 6% |
Other | 5 | 14% |
Unknown | 15 | 43% |