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Phases of embryo culture
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Phases of embryo culture

Once the egg and sperm have been fertilized in the laboratory, whether conventionally or by ICSI, the embryos generated are kept in culture.

Throughout the embryonic development, the embryos are evaluated and their morphological characteristics are analyzed. When 18 hours have passed since fertilization, one can see if the zygote has two polar corpuscles and two pronuclei.

3 day old embryos have already divided and it will be necessary to evaluate the number of cells, percentage of fragmentation, if there are vacuoles, etc. In the case of 5 day old embryos, which are called blastocysts, it is also necessary to analyze the degree of expansion.

Read the full article on: ( 76).
By MD, PhD (gynecologist), BSc, MSc (clinical embryologist), BSc, MSc (embryologist) and (invitra staff).
Last Update: 10/15/2020
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