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Updated: Mar 31, 2026
Fertility Preservation Through Oocyte Vitrification: Clinical and Laboratory Perspectives
Published on: September 16, 2021
The criteria for optimal down-regulation with gonadotropin-releasing hormone-agonist: a retrospective cohort study
Yu Zheng1, Xiyuan Dong1, Rui Wang1
1a Reproductive Medicine Center, Tongji Hospital, Tongji Medicine College, Huazhong University of Science and Technology , Wuhan , Hubei , China.
Objective:
The objective of this study is to investigate whether the degree of down-regulation using GnRH-agonists is associated with pregnancy outcomes.
Study Design:
This retrospective analysis was performed on 2708 cycles from 2514 patients undergoing down-regulation with the luteal phase long protocol. The serum oestradiol (E2D) and luteinising hormone (LHD) levels, the diameter of the largest follicle (DLFD) and the endometrial-thickness (ENTD) after down-regulation were used to evaluate the degree of down-regulation. One-way analysis of variance with the Bonferroni adjustment, the chi-square test and multivariate logistic regression analyses were used for the statistical analysis.
Results:
The cumulative clinical pregnancy rates (CCPR) and the cumulative live birth rates (CLBR) were higher in the cycles with E2D < 30 pg/ml (63.7%, OR = 1.405 (1.055-1.870) and 56.8%, OR = 1.372 (1.039-1.813)) and 30-55pg/ml (66.8%, OR = 1.439 (1.104-1.874) and 59.8%, OR = 1.397 (1.080-1.806)) than in those with E2D > 55 pg/ml (62.8% and 54.7%). There was a trend towards lower CCPRs and CLBRs in the cycles with DLFD > 10 mm or ENTD ≥ 6 mm; however, this difference was not significant.
Conclusion:
The degree of down-regulation is associated with ovarian response, pregnancy, and live birth. We propose the following criteria for optimal down-regulation: E2D 30-55 pg/ml, ENTD < 6 mm, and no apparent ovarian activity.
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