Blastocyst Culture is a technique in which an embryo is developed in the laboratory for 5-6 days after fertilisation before being placed in womb. The embryo gains many cells as a result of being developed for so many days. The embryos developed for 5-6 days are much more advanced than the ones developed for just three days. These Embryos are called blastocysts.
The embryos which survive for 5-6 days are more likely to produce the fruitful results. This enables embryologists to select from the more advanced embryos with better potential for implantation.
The biggest advantage of Blastocyst Culture method is that it significantly reduces the risk of multiple pregnancies. Also, the pregnancy and implantation success rate is higher in this technique because it is easy to determine the robust embryos after developing for 5-6 days hence only the competent embryo are transferred to uterus.