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Once eggs have been successfully retrieved, they go to our IVF lab, where they are identified and placed in a culture for incubation. Using the sperm from your partner or those of a donor, our embryologist will inseminate the eggs and place them in an incubator. In most instances, intracytoplasmic sperm injection, or ICSI, will be used, which calls for the injection of one individual sperm into each oocyte. After four to six hours of incubation, the eggs are examined, and the healthy eggs are selected, which can be fertilized or frozen for future use. Within about 18 hours from fertilization, the eggs grow as embryos. Before being transferred into the uterus, the eggs will be observed for two to five days. The blastocysts are placed in the woman’s womb five days after fertilization.