Editing Embryo transfer (section)

{{Short description|Method of assisted reproduction}}
{{Use dmy dates|date=September 2016}}
{{Infobox interventions |
  Name        = Embryo transfer 123 |
  Image       = Embryo, 8 cells.jpg |
  Caption     = 8-cell embryo for transfer 3 days after fertilization |
  ICD10       = |
  ICD9unlinked = |
  MeshID      = D004624 |
  OPS301      = |
  OtherCodes  = |
}}
'''Embryo transfer''' refers to a step in the process of [[Assisted reproductive technology|assisted reproduction]] in which [[embryo]]s are placed into the [[uterus]] of a female with the intent to establish a [[Pregnancy (mammals)|pregnancy]]. This technique - which is often used in connection with [[in vitro fertilization]] (IVF) - may be used in humans or in other animals, in which situations and goals may vary.

Embryo transfer can be done at day two or day three, or later in the [[blastocyst]] stage, which was first performed in 1984.<ref>{{cite journal | vauthors = Cohen J, Simons RF, Fehilly CB, Fishel SB, Edwards RG, Hewitt J, Rowlant GF, Steptoe PC, Webster JM | title = Birth after replacement of hatching blastocyst cryopreserved at expanded blastocyst stage | journal = Lancet | volume = 1 | issue = 8429 | pages = 647 | date = March 1985 | pmid = 2857991 | doi = 10.1016/s0140-6736(85)92194-4 | s2cid = 32746730 }}</ref>

Factors that can affect the success of embryo transfer include the endometrial receptivity, embryo quality, and embryo transfer technique.