SPECIAL LABORATORY METHODS

EXTENDED CULTIVATION

Embryo is usually in the blastocyst stage on day five after fertilization. The embryo reaches the uterus through fallopian tubes in this stage of pregnancy in a natural pregnancy. Extended cultivation and transfer on day five or six after fertilization, not as soon as day three, therefore imitates the course of natural pregnancy. Only a third of embryos reaches the blastocyst stage and that is why the extended cultivation can be considered a method of selection of high-quality embryos. This procedure increases the chance of successful treatment by 10 – 15%.

What are other advantages of extended cultivation?

  • cells collected from the blastocyst surface on day five after fertilization are suitable for genetic testing
  • blastocysts can be frozen with vitrification and stored with a good prospect of development after thawing for future cycles