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Updated: Nov 20, 2025
Human Blastocyst Biopsy and Vitrification
Published on: July 26, 2019
Endometrium preparation and perinatal outcomes in women undergoing single-blastocyst transfer in frozen cycles
Kai-Lun Hu1, Dan Zhang2, Rong Li3
1Center for Reproductive Medicine, Third Hospital, Peking University, Beijing, People's Republic of China; Key Laboratory of Reproductive Genetics (Ministry of Education) and Department of Reproductive Endocrinology, Women's Hospital, School of Medicine, Zhejiang University, Hangzhou, People's Republic of China.
Objective:
To investigate the association of endometrium preparation with perinatal outcomes.
Design:
Retrospective cohort study.
Setting:
University-affiliated fertility center.
Patient(S):
Twenty-one thousand six hundred and forty-eight women who underwent frozen single-blastocyst transfer from January 2013 to March 2019.
Intervention(S):
None.
Main Outcome Measure(S):
Cesarean delivery, preterm delivery (PTD), vaginal PTD, very preterm delivery (VPTD), postterm delivery, low birth weight (LBW), macrosomia, small for gestational age (SGA), large for gestational age (LGA), hypertensive disorders of pregnancy (HDP), gestational diabetes mellitus (GDM), premature rupture of membrane (PROM), placenta previa, and congenital abnormality.
Result(S):
Compared with natural cycles, hormone replacement cycles were associated with an increased risk of PTD, VPTD, cesarean delivery, macrosomia, PROM, and HDP. There was a trend toward an increased risk of vaginal PTD and LGA in hormone replacement cycles. Stimulated cycles were associated with an increased risk of postterm delivery and GDM. There was no statistically significant difference in the rate of SGA, placenta previa, or congenital abnormality among the three endometrium preparation methods.
Conclusion(S):
Hormone replacement cycles are associated with an increased risk of PTD, VPTD, cesarean delivery, LBW, macrosomia, PROM, and HDP. Stimulated cycles are associated with an increased risk of postterm delivery and GDM.
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