Effect of the initiation of progesterone supplementation in in vitro fertilization-embryo transfer outcomes: a prospective randomized controlled trial.

OBJECTIVE: To analyze the influence of the start point of luteal support on clinical pregnancy rate, implantation rate, and live birth rate of in vitro fertilization and embryo transfer (IVF-ET) cycles.

DESIGN: Single-center prospective randomized controlled trial.

SETTING: University-affiliated IVF unit.

PATIENT(S): Women ≤35 years of age with day 3 FSH levels <15 mIU/mL, who were undergoing their first IVF-ET cycles and received ovarian stimulation with the use of a GnRH agonist long protocol.

INTERVENTION(S): The patients were randomized on the day of hCG trigger to receive luteal phase support either 1 day after oocyte retrieval (group A) or on the day of oocyte retrieval (group B).

MAIN OUTCOME MEASURE(S): Clinical pregnancy rate, implantation rate, miscarriage rate in the first trimester of pregnancy, and live birth rate per embryo transfer cycle.

RESULT(S): Two hundred thirty-three patients were enrolled in this study: 117 were assigned to group A and 116 to group B. The clinical pregnancy rate (group A vs. group B: 55.3% vs. 51.5%), implantation rate (38.4% vs. 38.0%), and miscarriage rate (7.7% vs. 7.5%) were similar between the two groups. The live birth rate also did not significantly differ between the two groups (45.7% vs. 46.6%).

CONCLUSION(S): Our study indicated that the initiation of progesterone supplementation 1 day after oocyte retrieval did not decrease the clinical pregnancy rate, implantation rate, or live birth rate in women undergoing IVF-ET cycles with the use of the GnRH agonist long protocol.

CLINICAL TRIAL REGISTRATION NUMBER: ChiCTR-IPR-14005293.