Recurrent implantation failure: definition.
OBJECTIVE
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.


CONCLUSIONS
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 > or = 8, 8-cell stage embryos or > or = 5 blastocyst embryos.
Division of Reproductive Endocrinology and Infertility, Evanston Northwestern Healthcare, Evanston, IL, USA. jsrinehart@aol.com
John
J
Rinehart
D000026:Abortion, Habitual / Q000209:etiology*; D010064:Embryo Implantation; D005260:Female; D005307:Fertilization in Vitro; D006801:Humans; D012008:Recurrence; D017211:Treatment Failure