Fresh embryo transfer versus frozen embryo transfer in in vitro fertilization cycles: A systematic review and meta-analysis

Matheus Roque, Karinna Lattes, Sandra Serra, Ivan Solà, Selmo Geber, Ramón Carreras, Miguel Angel Checa

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353 Citations (Scopus)

Abstract

Objective: To examine the available evidence to assess if cryopreservation of all embryos and subsequent frozen embryo transfer (FET) results in better outcomes compared with fresh transfer. Design: Systematic review and meta-analysis. Setting: Centers for reproductive care. Patient(s): Infertility patient(s). Intervention(s): An exhaustive electronic literature search in MEDLINE, EMBASE, and the Cochrane Library was performed through December 2011. We included randomized clinical trials comparing outcomes of IVF cycles between fresh and frozen embryo transfers. Main Outcome Measure(s): The outcomes of interest were ongoing pregnancy rate, clinical pregnancy rate, and miscarriage. Result(s): We included three trials accounting for 633 cycles in women aged 27-33 years. Data analysis showed that FET resulted in significantly higher ongoing pregnancy rates and clinical pregnancy rates. Conclusion(s): Our results suggest that there is evidence that IVF outcomes may be improved by performing FET compared with fresh embryo transfer. This could be explained by a better embryo-endometrium synchrony achieved with endometrium preparation cycles. Copyright © 2013 American Society for Reproductive Medicine, Published by Elsevier Inc.
Original languageEnglish
Pages (from-to)156-162
JournalFertility and Sterility
Volume99
Issue number1
DOIs
Publication statusPublished - 1 Jan 2013

Keywords

  • endometrial receptivity
  • Fresh embryo transfer
  • frozen embryo transfer
  • pregnancy outcome

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