Blastocyst culture is an advance A.R.T. procedure whereby the embryo is cultured in the laboratory for 5 days before being transferred into the uterus of the patient. A blastocyst consists of two types of cells: the outer layer of cells called trophectoderm which is the future placenta, and the inner of cells called inner cell mass which is the future fetus.

Only the toughest and strongest embryos can survive in the laboratory until the blastocyst stage. By transferring blastocyst, the chance of pregnancy is greatly increased. Embryo survival rate in the laboratory is also highly depending on the laboratory condition and the skill of the embryologist. Only experienced embryologists are capable to generate good quality embryos to be cultured to the blastocyst stage.