Blastocyst culture, i.e. extended embryo culture
With the help of extended embryo culture, it is possible to study the development of embryos and choose the embryo with the best development capability for transplantation. Blastocyst culture is particularly helpful if there are repeated failed treatments in the past.
Blastocyst culture refers to extended embryo culture. In blastocyst culture, embryos are grown in the laboratory longer than usually in in vitro fertilisation until the blastocyst stage, after which the embryo is transferred to the uterus. The blastocyst culture takes 5–6 days.
With the help of extended embryo culture, it is possible to study the development of embryos and choose the embryo with the best development capability for transplantation. Extended embryo culture is particularly helpful if there are repeated failed treatments in the past. On average, a third of embryos develop to the blastocyst stage. If multiple high-quality blastocyst embryos are obtained as a result of the culture, the excess may be cryopreserved for possible subsequent embryo transfers. The probability of the onset of a pregnancy after an embryo transfer with a blastocyst is approximately 40%.