title: Introduction: are we ready to eliminate the transfer of fresh embryos in in vitro fertilization?
abstract: The rationale to freeze all embryos to avoid transfer into a supraphysiologic environment to improve safety and efficacy is compelling, but not yet proven. How do we decide?
authors.affiliation: Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania. Electronic address: kbarnhart@obgyn.upenn.edu.
authors.forename: Kurt T
authors.initials: KT
authors.lastname: Barnhart
mesh_terms: D015925:Cryopreservation; D004624:Embryo Transfer / Q000009:adverse effects; D004622:Embryo, Mammalian; D005260:Female; D005298:Fertility; D005307:Fertilization in Vitro / Q000009:adverse effects; D006801:Humans; D007246:Infertility / Q000503:physiopathology / Q000628:therapy*; D011247:Pregnancy; D013997:Time Factors; D016896:Treatment Outcome
keywords: In vitro fertilization; cryopreservation; embryo transfer; frozen embryo transfer