Objectives: To compare effects of final oocyte maturation trigger with GnRHa under a bolus of 0.2 mg triptoreline (Dipherelin®) and luteal phase support with 1500 IU of u-hCG on the day of IUI versus trigger with 5000 IU of u-hCG (Pregnyl® 5000 IU) perfomed in ovulation induction or mild ovarian stimulation with IUI cycles.