Cryopreservation of blastocysts is the most feasible strategy in good responder patients.

Objective: To assess on which day to cryopreserve and transfer thawed embryos in good-responder patients by comparing the cycle outcomes of day 3 transfers vs blastocysts formed through extended culture before or after cryopreservation.

Design: Retrospective clinical study.

Setting: Private IVF center.