Initiation of Ovarian Stimulation With Recombinant-human FSH (Bemfola®) in the Late Follicular Phase

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Objective: To determine whether late follicular stimulation using recombinant-human FSH has comparable outcomes to treatment using recombinant-human FSH in early follicular phase in a flexible GnRH (Gonadotropin-releasing hormone) antagonist protocol, in oocyte donor patients. Design: Open label, ph...

Objective: To determine whether late follicular stimulation using recombinant-human FSH has comparable outcomes to treatment using recombinant-human FSH in early follicular phase in a flexible GnRH (Gonadotropin-releasing hormone) antagonist protocol, in oocyte donor patients. Design: Open label, phase 3 pilot randomized trial using a two-arm design with 1:1 allocation ratio Patients: Oocyte donors (aged 18-36 years) Intervention(s): Reference group: Start of ovarian stimulation with recombinant-human FSH (Bemfola 225 IU daily) from day 2 of follicular phase onwards. Initiation of GnRH antagonist (ganirelix, 0.25mg/day) on stimulation day 6 till day of trigger. Investigational group: Start of ovarian stimulation with recombinant-human FSH (Bemfola 225 IU daily) from day 12 of the menstrual cycle onwards. Start of GnRH antagonist (ganirelix 0.25mg/day) when serum LH (Luteinizing Hormone) > 10 IU/L, till day of trigger. Oocyte maturation trigger with GnRH agonist (0.2mg Gonapeptyl) in both groups.

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