Trial Parameters
Brief Summary
The use of antagonist ovulation stimulation program is increasing year by year, because of its convenience, flexibility, and prevention effect of ovarian hyperstimulation syndrome. However, many researchers and clinicians believe that the clinical outcomes of antagonist regimens are worse than those of classical long-term regimens. Studies showed that the reasons for that maybe antagonist protocol results in poor effect on oocytes maturation or endometrial receptivity. At present, the trigger time of antagonist regimen is more than three follicles with diameters of ≥17 mm, which makes the duration of gonadotrophin application in antagonist regimen is shorter than that of long regimen. Whether the trigger time of antagonist regimen is too early to cause adverse effects on oocytes, embryos and eventual clinical outcomes is unknown. This study hopes to compare regular trigger timing and 1～2 days delay of trigger in ovarian stimulations by antagonist protocol，in order to study whether delay 1～2 days of trigger will get better clinical outcomes than regular trigger timing in ovarian stimulations by antagonist protocol in in vitro fertilization (IVF)/Intracytoplasmic sperm injection (ICSI). The results of this study will help infertile couples and clinicians to know and choose the optimal treatment in antagonist protocol.
Eligibility Criteria
Inclusion Criteria: * Age: ≥18 and \<42 years old * AFC: ≥5 and \<20 * AMH: ≥1.1 ng/mL and \<2.5 ng/mL * BMI: ≥18.5 Kg/m2 and \<29 Kg/m * First or second ART cycle * Regular menstrual cycles (between 22 and 35 days) * Two ovaries present * Planned for single or double day 3 transfer * Infertile couples scheduled for their first IVF/ICSI cycle with fixed antagonist protocol. * Informed consent obtained. Exclusion Criteria: * Women with contraindication for IVF or ICSI, such as poorly controlled type 1 or type 2 diabetes mellitus; undiagnosed liver disease or dysfunction (based on serum liver enzyme test results); renal disease or abnormal serum renal function; significant anemia; history of deep venous thrombosis, pulmonary embolus or cerebrovascular accident; uncontrolled hypertension or known symptomatic heart disease; history of (or suspected) cervical carcinoma, endometrial carcinoma or breast carcinoma; and undiagnosed vaginal bleeding. * Previous history of poor ovarian response (