Effectiveness of different protocols for slow freezing of human blastocysts

  • Borut Kovačič
  • Nina Hojnik
  • Veljko Vlaisavljević


Background: Pregnancy rate after the transfer of frozen / thawed human blastocysts has been lower in comparison with the pregnancy rate in in vitro fertilization (IVF) cycles with fresh embryos. There is a need for the optimization of freezing protocols. Conclusions: All freezing protocols using a simple freezing medium were more effective than protocol with a complex medium. Their application in IVF patients with frozen surplus blastocysts (these patients delivered in fresh cycles in 51.4 %) increases the cumulative delivery rate by an additional 15.2 % with every thawing cycle. The morphology of blastocysts and cycle preparation for transfer had the strongest influence on the success of freezing programme.


Download data is not yet available.
How to Cite
Kovačič B, Hojnik N, Vlaisavljević V. Effectiveness of different protocols for slow freezing of human blastocysts. ZdravVestn [Internet]. 1May2011 [cited 22Nov.2019];80(SUPPL). Available from: https://vestnik.szd.si/index.php/ZdravVest/article/view/143
Original article

Most read articles by the same author(s)