Background:Estrogen and progesterone are two crucial factors for endometrial preparation in frozen embryo transfer (FET) cycles. Studies assessing different forms of estradiol in FET have published already but literature lacks enough surveys on transdermal estrogen application in reproductive medicine.Objective:To investigate the effects of trans dermal estrogen (Oestrogel) on pregnancy rates in patients that candidate for FET cycle. Materials and Methods:In this randomized clinical trial, 100 women undergoing FET cycles referred to Imam Khomeeini Hospital were enrolled in two groups, randomly. Group I received 8 mg/day estradiol valerate (E2 tablet) orally and group II were treated with 6 mg/day transdermal oestrogel gel after suppression with gonadotropin releasing hormone agonist. In both groups medication were started in the first day of menstruation cycle and continued until endometrial thickness reached 8 mm. Pregnancy rates (chemical, clinical, and ongoing), abortion rate, live birth rate, and frequency of complications were compared between two groups. Results: Chemical and clinical pregnancy rates were not significantly different between two groups (p=0.384). The abortion rate was significantly lower in group II than group I (p=0.035). Ongoing pregnancy and the live birth rates were significantly higher in group II (p=0.035). The rate of complication was not different in two groups.Conclusion:Oestrogel seems to enhance ongoing pregnancy and live birth rates in comparison to estradiol valerate tablet.

Background Thyroid dysfunction can affect fertility and miscarriage risk by affecting the process of follicular growth, embryo development, implantation, and placental formation. It has been suggested that thyroid disorders are associated with ovarian reserve by affecting the follicular process. The aim of the present study was to investigate the relationship between thyroid hormone levels and ovarian reserve. Methods Three hundred fourteen women with infertility due to various etiologies were enrolled in this study (172 individuals with Anti-Mullerian hormone (AMH) level ≥ 1.1 ng/ml and 142 individuals with AMH < 1.1 ng/ml). Serum levels of follicle-stimulating hormone (FSH), estradiol (E2) on day 2–4 of menstrual cycles, AMH, Thyroid-stimulating hormone (TSH), and thyroxine (free T4) were evaluated. Results In participants with age over 35 years, median TSH level in women with AMH < 1.1 ng/ml was significantly higher than those with AMH ≥1.1 ng/ml (P-value =0.037). There was no significant difference in body mass index (BMI) in patients with age older than 35 years and younger than 35 years sub-groups based on AMH level (P-value = 0.102, and P-value = 0.909 respectively). With one unit increase in TSH level, the odds of having AMH < 1.1 ng/ml increases by 1.25 times or by 25% (P-value =0.017). Receiver operator characteristic (ROC) curve analysis showed a TSH cut-off point of 1.465 mIU/L in participants over 35 years in identifying decreased AMH level. Conclusion Our study supports the relationship between TSH level and ovarian reserve so that with an increase in TSH from a certain level is associated with a decrease in ovarian function.

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