Tag: zona pellucida

Sperm’s journey to the egg

Obstacles in the female reproductive tract

Since its formation to the fertilization of the egg, spermatozoids have to cross a complicated path full of obstacles. Only one spermatozoid will overcome all the barriers and fertilize the egg, creating therefore a new being.

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Quality of the eggs

Finding out the state of the ovarian reserve

Using several techniques the quality of the eggs can be found out to know the reproductive potential of a woman, and if needed, which assisted reproduction technique to apply.

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First month of pregnancy

Early stages of pregnancy

It’s the beginning of a long process. Many women don’t even know they are pregnant during the first month. The most important event is the implantation of the embryo in the endometrium.

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4 weeks pregnant

Fourth week

That week marks the finish of the first month, there are no important physical nor emotional changes. If they are not tested, they don’t even realise they are pregnant.

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Assisted hatching (AHA)

Assisted hatching

Assisted hatching is a technique used to make it easier for the embryo to break through its protein-rich coat, the zona pellucida (ZP). The aim is to enable implantation and, therefore, increase the chances for pregnancy in some particular cases.

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Embryo quality and grading

Grade I

Assessment of embryo quality is determined by checking their development once a day from the moment of fertilisation to the day in which embryo transfer is performed –on day 3 or day 5, depending on the case.

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