Abstract
Use of frozen sperm in non-male factor infertility is often needed in donor cycles. Most studies to date examining outcomes of fresh vs frozen sperm are unable to control for oocyte quality. Studies examining sibling oocytes represent a unique model to control for oocyte quality. A recent small study using this model found worse outcomes in the frozen group. We sought to evaluate, in a large cohort, if fresh and frozen ejaculated sperm are associated with similar pregnancy outcomes by analyzing paired donor egg recipient (DER) cycles.
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