Ongoing Pregnancy Rates with Daily Recombinant Follicle-Stimulating Hormone/Gonadotropin-Releasing Hormone Antagonist Protocol in a Large North American Cohort of In Vitro Fertilization/Intracytoplasmic Sperm Injection Patients by Day of Embryo Transfer

Abstract

BACKGROUND: The reference arm of a recent, randomized, double-blind, clinical trial (Engage) included a large cohort of patients from North American (NA) sites. Patients randomized to this reference arm were treated with a standardized rFSH/GnRH antagonist protocol but could have a day 3 or day 5 ET with one or two embryos transferred.