What is the difference between an embryo, morula, and a blastocyst transfer?
Embryo Transfer: An embryo transfer is done 2 or 3 days after retrieval. A day 2 embryo usually contains anywhere from 2-4 cells. A day 3 embryo is usually around 8-10 cells in size. Morula Transfer: A morula transfer is done 4 days after retrieval. Morula transfers are not as common as embryo or blastocyst transfers. A Morula usually contains at least 30 cells, but as the cell numbers increase the morula compacts and the cell borders become less distinguishable. Blastocyst Transfer: A blastocyst transfer is done 5-6 days after retrieval. A blastocyst has so many cells that individual cells are no longer recognizable.
