Successful pregnancy requires implantation of the embryo into the endometrium. Failure to achieve this reproductive phenomenon of embryo endometrial adhesion results in menstruation. In an IVF cycle we can predict the quality of embryo and its chances of succeeding in the implantation process. A mismatch in development of embryo and endometrium can result in failure to achieve pregnancy. At times very good embryos fail to implant due to endometrial rejection. Endometrial scratch or stimulation may help these cases of repeated implantation failure.
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