Comparison of Single vs Group Embryo Culture in Micro-well Group Culture Dish

Inclusion Criteria: female age uner 40, male age under 60 patients undergoing IVF-treatment with oocyte collection after ovarian hyperstimulation having signed the study-specific consent form patient fulfilling clinic's standard criteria for blastocyst culture minimum 5 normally fertilized oocytes at the time of fertilization check Exclusion Criteria: use of any type of surgically retrieved sperm cells patients undergoing any kind of genetic diagnosis at any developmental stage \-