Whether immediate frozen-thawed embryo transfer improves IVF outcome in non-elective freeze all policy

With the spread of vitrification techniques, the survival rate after thawing of embryos rapidly increased, reaching up to 90% for vitrified blastocysts. As a result of the advances in embryology laboratory techniques, the “segmentation” of in vitro fertilization (IVF)-embryo transfer cycles has been gradually introduced in the common practice as an alternative to fresh IVF for the protection of woman’s health and to improve the chances of implantation. [...]