A new paper showing an influence of the menstrual cycle on TSH levels in women on T4. It is easily downloadable. The abstract is below.
Front. Endocrinol., 29 September 2017 | doi.org/10.3389/fendo.2017....
Serum Thyrotropin and Phase of the Menstrual Cycle
Salvatore Benvenga, Flavia Di Bari, Roberta Granese and Alessandro Antonelli6
Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy
Master Program on Childhood, Adolescent and Women’s Endocrine Health, University of Messina, Messina, Italy
Interdepartmental Program of Molecular & Clinical Endocrinology, and Women’s Endocrine Health, Azienda Ospedaliera Universitaria Policlinico “G. Martino”, Messina, Italy
Department of Human Pathology, University of Messina, Messina, Italy
Division of Obstetrics and Gynecology, University of Messina, Messina, Italy
Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy
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.