Abstract
Continued improvement in vitrification has made frozen embryo transfer (FET) a viable alternative to fresh embryo transfer, and use of a 'freeze all' strategy for ART has increased. Supraphysiologic steroid hormones resulting from ovarian stimulation for fresh IVF may adversely affect implantation. Preparation for FET may more closely mimic the 'natural' hormonal milieu, leading to improved cycle outcomes. Our objective was to use SART data to compare live birth rates from FET vs. those from fresh embryo transfer for both autologous and donor IVF cycles and to evaluate trends over time.
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