Optimal Endometrial Thickness in Fresh and Frozen-Thaw In Vitro Fertilization Cycles: An Analysis of Live Birth Rates From 96,000 Autologous Embryo Transfers

(Abstracted from Fertil Steril 2022;117:792-800) A routine procedure of in vitro fertilization (IVF) cycles is to measure the endometrial thickness, as it has been determined that a measurement of <8 mm at human chorionic gonadotropin (HCG) trigger in fresh IVF-embryo transfer (IVF-ET) can increase the risk of ectopic pregnancy, spontaneous abortion, low birth weight, placenta previa, and other obstetric complications. In direct dichotomy to this, an endometrial thickness above 7 to 8 mm has a general association of improved IVF outcomes.

Automated summary

A measurement of endometrial thickness less than 8mm during the human chorionic gonadotropin triggering phase in IVF-ET can increase the risk of various obstetric complications, while an endometrial thickness above 7 to 8mm is generally associated with improved IVF outcomes.