Establishing a Minimum Predictive Threshold Follicular Size and Oocyte Retrieval in ICSI Cycle

Inclusion Criteria: * women aged 18 to 35 years undergoing ICSI. * at least four follicles above 15 mm in diameter on the day of trigger * Downregulation using either GNRH antagonist or agonist protocol * Provision of written ,informed consent * BMI 18 to 35 kg per meter square Exclusion Criteria: * anticipated poor responder, according to Bologna criteria * cycle canceled prior to retrieval or without trigger administration * Oocyte cryoperservation cycles or natural IVF cycles * presence of ovarian pathology affecting the follicular assessment (endometriosis,cysts )