Is transferring a lower-quality embryo with a good-quality blastocyst detrimental to the likelihood of live birth?

Objective: To determine if transferring a lower-quality embryo with a good-quality blastocyst is detrimental, given that evidence suggests that embryos can signal the endometrium and that embryo quality may affect negatively endometrial receptivity.

Design: Retrospective cohort study.

Setting: In vitro fertilization center.