Embryos are selected for replanting, which is divided into 4 or more cells. Embryo transfer takes place on days 3 and 5, depending on the number of high-quality fertilized eggs that are actively dividing. Thus, the transfer of three-day embryos is carried out when receiving from 3 to 5 high-quality embryos. On day 2, embryo replanting is performed during IVF if only 1-2 qualitative embryos are obtained, and if there are 6 or more embryos, they are placed for 5 days. For the implementation of the transfer, morphological characteristics of embryos are taken into account, they are of type A, B, C, and D. Preference is given to types A and B, and type C and D embryos are placed in the absence of the first.
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