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Embryo transfer can be done at day two or day three, or later in the blastocyst stage, which was first performed in 1984. [1] Factors that can affect the success of embryo transfer include the endometrial receptivity, embryo quality, and embryo transfer technique.
Implantation bleeding occurs between 7 and 14 days after fertilization, [57] and is a small amount of light vaginal bleeding or spotting that can occur in early pregnancy due to the blastocyst penetrating the lining of the uterus during implantation.
Repeated implantation failure (RIF) is the repeated failure of the embryo to implant onto the side of the uterus wall following IVF treatment. [1] Implantation happens at 6–7 days after conception and involves the embedding of the growing embryo into the mothers uterus and a connection being formed. [ 2 ]
The first IVF procedure was a wash—her doctor wasn’t able to do a transfer because none of the embryos ended up being viable after testing. The same thing happened with the second round.
Some studies also suggest that autoimmune disease may also play a role in decreasing IVF success rates by interfering with the proper implantation of the embryo after transfer. [ 31 ] Aspirin is sometimes prescribed to people for the purpose of increasing the chances of conception by IVF, but as of 2016 [update] there was no evidence to show ...
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".
The incorporation of time lapse imaging tools in an incubator is a novel technology that allows images of embryo development to be captured frequently. [3] [4] This together with softwares [5] allows embryologists and clinicians to interpret the embryo development information captured and select embryos for transfer in IVF treatment.
Human embryology is the study of this development during the first eight weeks after fertilization. The normal period of gestation (pregnancy) is about nine months or 36 weeks. The germinal stage refers to the time from fertilization through the development of the early embryo until implantation is completed in the uterus.