Culturing the embryos to the blastocyst stage, or day 5 or 6 after egg retrieval, may be recommended for patients that have at least 8 fertilized oocytes on the first day after retrieval. The decision to culture embryos to day 5 is based on the development of the embryos and the patient’s individual history. Blastocysts have higher implantation and pregnancy rates, and fewer embryos are usually transferred back to the patient than would be transferred on day 3. Culturing embryos to day 5 may not always be beneficial, as some patients may have embryos that do not tolerate in vitro culture well.
If you have any questions on blastocyst transfer or are interested in scheduling an appointment, please call our office (713)467-4488.