Allocation of sibling oocytes to IVF and ICSI in the first cycle minimizes risk of fertilization failure. For patients with limited number of oocytes, ICSI technique is recommended.

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nancy, and FET characteristics including number of embryos transferred, number of good-quality embryos transferred, stage of embryos transferred and endometrial thickness on ET day had no statistically significant differences among the three groups. As for pregnancy outcome, the ectopic pregnancy rates and miscarriage rates also had no statistically significant differences among the three groups. However, the clinical pregnancy rate (47.6% vs. 44.0%, p¼0.001, 47.6% vs. 43.3%, p<0.001, respectively) and live birth delivery rate (31.1% vs. 28.2%, p¼0.004, 31.1% vs.26.4%, p<0.001, respectively) were statistically significant higher in stimulated cycle group both than in natural cycle group and in hormone therapy cycle group while no statistically significant differences were detected between the latter two groups. CONCLUSIONS: Stimulated cycles are associated with significant higher clinical pregnancy rate and live birth delivery rate both than natural cycles and hormone therapy cycles in FET cycles of IVF/ICSI.