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Why do we transfer embryos
on day 5?
• It is believed that it results in: • higherpregnancyrate
• lowermultiplepregnancyrate
• PossibilityofdoingPGTonthe24 chromosomes.
Why extended culture?
1. To mimic natural physiology of a blastocyst reaching the uterine cavity day 5‐6
2. Embryo selection: to ensure embryonic genome activation at 8 cell stage, and successful extended culture to blastocyst. However, this is not always true as in vitro survival is different from in vivo survival.
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PRECONGRESS COURSE 15 I BARCELONA, SPAIN – 1 JULY 2018 13