In the past, embryos were typically cultured for 2-3 days after egg retrieval before being transferred or frozen. Embryos usually reach the blastocyst stage, where they form a fluid-filled cavity, at around 5-7 days of age. With extended culture, the development of embryos can be monitored more closely. Some embryos may not progress, while others continue to develop. A well-developed blastocyst is more likely to result in a successful pregnancy than, for example, a 2-day-old 4-cell embryo.
At Dextra Fertility Clinic, embryos are primarily cultured to the blastocyst stage.