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Purpose  Increasing the number of transferred blastocysts sometimes is selected for patients with repeated implantation failure ( RIF ). To confirm this strategy, the pregnancy rates ( PR s) were compared among the groups who had transferred either a single morphologically good blastocyst ( MGB  group), double blastocysts with both a  MGB  and a morphologically poor blastocyst ( MGB  +  MPB  group), or a double‐ BT  with 2  MGB s (two‐ MGB  group).    Methods  This study was performed between April, 2009 and September, 2014, including 634 cycles for 354 patients with  RIF . All the patients received cryopreserved blastocysts in either hormone replacement or natural ovulatory cycles. The included  MGB s were at more than the Gardner grade 3 BB  stage. The  PR  and implantation rates ( IR s) among the three groups were statistically evaluated by the chi‐square test. Statistical significance was set at  P  < .01.    Results  Although the  PR s were similar in these three groups, the  IR  in the  MGB  +  MPB  group was significantly lower than that of the  MGB  group. The rate in the two‐ MGB  group also was significantly lower than that of the  MGB  group.    Conclusion  A double‐ BT  with a  MGB  and a  MPB  does not increase the pregnancy rate, compared with a single‐ BT  with a  MGB  among patients with  RIF .

reproductive medicine and biology

Morphologically poor blastocysts could affect the implantation rate of a morphologically good blastocyst during a double‐blastocyst transfer for patients who have experienced repeated implantation failures