Day 5 expanded blastocysts transferred on same day have comparable outcome to those left for more extended culture and transferred on day 6.
Journal of Assisted Reproduction and Genetics, 08/03/2012
Clinical Article
Elgindy E and Elsedeek M.S E A.– This prospective cohort study is aimed at comparing the outcome of blastocysts showing expansion on day 5 and transferred on day 5 or 6, in comparison with those unexpanded and transferred on day 6. The study reports better implantation and pregnancy rates with earlier expanding blastocysts regardless of the time of transfer.



