Recurrent implantation failure - an overview of current research.

Background: Recurrent implantation failure (RIF) can be defined as a failure to achieve a clinical pregnancy after transfer of at least four embryos of good quality in a minimum of three fresh or frozen cycles in women under the age of 40. RIF is often a complex problem with a wide variety of etiologies and mechanisms as well as treatment options.
Summary: Anatomical conditions of the uterus, thrombophilia, genetic abnormalities, or immunological factors are only a few examples which could be responsible for RIF. The recommendations for women with RIF vary depending on the source of their problem. There is not just one treatment option, but many depending on the etiology and the severity of the problem.
Key Message: However, it would help to establish a set of standardized examinations and tests to use, in order to do a preliminary evaluation on each patient, which would then hopefully direct the approach of treatment for each individual couple.