Clinical and Experimental Obstetrics & Gynecology (CEOG) is published by IMR Press from Volume 47 Issue 1 (2020). Previous articles were published by another publisher on a subscription basis, and they are hosted by IMR Press on imrpress.com as a courtesy and upon agreement with S.O.G.
Frozen embryo transfer outcome according to reason for freezing the embryos
Purpose: To determine if cryopreservation influences pregnancy outcome following transfer. Methods: Retrospective cohort analyses of frozen embryo transfer (ET) cycles divided into five different categories according to reason for freezing. Results: Frozen embryos remaining as a result of failing to conceive with the previous fresh transfer or those remaining because of cancellation of fresh ET related to inadequate endometrial thickness, result in lower pregnancy rates (PRs). Conclusions: The fact that embryos never deselected in a group whose fresh ET was canceled because of risk of ovarian hyperstimulation did not have the best results suggests that these oocytes may not be of equal quality to those attained with a more modest response.