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For implantation to take place the uterus must become receptive. Uterine receptivity involves much cross-talk between the embryo and the uterus, initiating changes to the endometrium. This stage gives a synchrony that opens a window of implantation that enables successful implantation of a viable embryo. [4]
Even after an embryo successfully implants and begins producing hCG, it still takes a few days for the hormone to build to a high enough level to be detected by a pregnancy test.
The germinal stage refers to the time from fertilization through the development of the early embryo until implantation is completed in the uterus. The germinal stage takes around 10 days. [1] During this stage, the zygote divides in a process called cleavage. A blastocyst is then formed and implants in the uterus.
The embryo hatches from its protein shell (zona pellucida) and performs implantation onto the endometrial lining of the mother's uterus. (day 5–6 of fertilization. [1]) If separation into identical twins occurs, 1/3 of the time it will happen before day 5. [2]
Before implanting into the uterine wall the embryo is sometimes known as the pre-implantation embryo or pre-implantation conceptus. [10] Sometimes this is called the pre-embryo a term employed to differentiate from an embryo proper in relation to embryonic stem cell discourses. [11]
The embryo becomes embedded in the endometrium in a process called implantation. In most successful pregnancies, the embryo implants 8 to 10 days after ovulation. [7] The embryo, the extra-embryonic membranes, and the placenta are collectively referred to as a conceptus, or the "products of conception".
Why do people typically freeze eggs or embryos? There are several reasons. “People typically freeze eggs as a way to preserve their fertility,” Dr. Asima Ahmad , co-founder and chief medical ...
Ashleigh Sunderlin (right) and her surrogate Julianne Richardson (left) joining hands earlier this year during an embryo implant procedure. Sunderlin, a Grand Ledge High School graduate, searched ...