Impact of trigger-day serum luteinizing hormone levels on embryo quality and pregnancy outcomes in overweight and obese women undergoing GnRH antagonist protocols: a retrospective cohort study

Introduction Luteinizing hormone (LH) is critical for follicular development and IVF pregnancy outcomes, but evidence linking trigger-day serum LH levels to IVF-ET outcomes in overweight patients is scarce. This study investigated the impact of trigger-day LH levels on IVF-ET outcomes in overweight and obese women (BMI ≥ 25 kg/m 2 ) undergoing flexible GnRH antagonist controlled ovarian stimulation (COS). Methods Clinical data from 1,135 overweight and obese women (first IVF/ICSI-ET cycle, July