Blastocyst transfers are just starting to become routinely used in some clinics due to the introduction of new extended embryo culture techniques and some of the disadvantages associated with cleavage stage transfers. Blastocyst transfers have the benefit of the embryologist choosing the top quality embryo.
With blastocysts you are fully able to see the quality of the embryos, only the most viable embryos are expected to develop into blastocysts; this is the result of self-selection. Blastocyst transfers have been used to treat patients with poor quality embryos, low number of embryos and oocytes, or with multiple IVF failures. In these situations extended embryo culture has been associated with an increase in IVF success. The ability for better embryo selection and the introduction of David Gardner’s stage specific media (G1/G2), made blastocyst transfers increasingly popular.
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