inviTRA Egg and sperm donation magazine
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Law in the UK
Pregnancy with donor eggs
Egg donation & surrogacy
Becoming an egg donor
What is it?
IUI with donor sperm
Options for lesbian couples
Becoming a sperm donor
Definition and options
In vitro fertilization
Intracytoplasmic sperm injection
Preimplantation genetic diagnosis
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Some assisted reproductive techniques, such as in vitro fertilisation (IVF) or ICSI, perform egg fertilisation outside the woman's body. For this reason, embryo culture is necessary up to the day in which the...
Embryo culture up to blastocyst stage
Blastocyst is the stage in which embryo implantation within the uterus occurs naturally. To reach this stage, the embryo is cultured up to day 5-6 by means of a sequential culture system.
Classification of embryos according to their quality
Embryos can be classified in 4 categories –from A to D– ranging from best quality to least developed embryos. This classification is mainly visual and rather subjective, but there are also several studies to...
Embryo transfer on day 3 or on day 5?
A new study proposes the transfer of the embryos 5 days after the embryo culture, instead of 3 days after. According to this study, it may increase the pregnancy rate and, conversely, decrease the rate of multiple...
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