Outcomes of 36 vs 38 Hour Intervals From Ovulation Trigger To Oocyte Pick-Up:A Multi-Center Randomized Controlled Trial

Inclusion Criteria: * To undergo assisted reproductive technology (ART) treatment and planning to undergo embryo transfer procedure within 6 months of oocyte collection * Female partner to be between 18-42 years old at the time of informed consent * Both partners to consent to participate in the study and be legally eligible to give consent. Exclusion Criteria: * Female partner to have participated in the study previously. * Female partner to have a body mass index of 35 kg/m2 or above. * Female partner to have a systemic disease that may affect ART or pregnancy outcomes (e.g. antiphospholipid syndrome, severe liver dysfunction, diabetes mellitus, history of venous thrombosis, advanced renal or cardiac diseases). * Presence of congenital uterine anomaly (1-Women whose uterine anomalies are surgically corrected are not excluded; 2- Arcuate uterus is not accepted as a congenital uterine anomaly). * Presence of submucous or intramural fibroid that distorts the endometrial cavity. * Diagnosis of stage 3 or 4 endometriosis in the female partner. * Female partner planned to undergo double ovarian stimulation. * Known karyotype anomaly in at least one of the partners. * Diagnosis of azoospermia (no sperm cells in the ejaculate) in the male partner. * History of recurrent implantation failure \[defined according to the scoring system by Ata et al in 2021 available at https://bit.ly/3huVLOn (Ata B, Kalafat E, Somigliana E. A new definition of recurrent implantation failure on the b…