assisted reproductive technique embryo transfer http://purl.bioontology.org/ontology/MEDDRA/10073184 http://purl.bioontology.org/ontology/MESH/D004624 http://purl.bioontology.org/ontology/SNOMEDCT/75456002 http://purl.obolibrary.org/obo/NCIT_C16541 https://en.wikipedia.org/wiki/Embryo_transfer https://www.wikidata.org/wiki/Q237118 ET The transfer of mammalian embryos from an in vivo or in vitro environment to a suitable host to improve pregnancy or gestational outcome in human or animal. In human fertility treatment programs, preimplantation embryos ranging from the 4-cell stage to the blastocyst stage are transferred to the uterine cavity between 3-5 days after fertilization in vitro. blastocyst transfer transplantation surgery