Recurrent implantation failure: Definition

Abstract

Purpose: An attempt to define recurrent implantation failure. Methods: Literature review. Results: Numerous definitions of recurrent implantation failure exist. The complexity and redundancy of the process of implantation makes a single definition difficult to determine. Conclusion: Each center must establish a definition of recurrent implantation failure based upon the data from that center. The definition of RIF used in our program requires the transfer of ≥8, 8-cell stage embryos or ≥5 blastocyst embryos. © 2007 Springer Science+Business Media, LLC.