oocyte

Embryonic development: the embryo on day 1 (D1)

When an oocyte is in an optimum state of maturation, ovulation takes place. This is known as day 0 of development (D0) and fertilisation by a competent spermatozoon must take place during this period.

When the oocyte is fertilised, it is then known as a zygote and
we are now on D1 of development. Certain characteristics and essential
structures need […]

2019-01-04T09:51:56+02:004 de January de 2019|0 Comments

Embryo fragmentation

Embryo fragmentation is a phenomenon that takes place in most embryos and its origin is not entirely clear. Some studies would seem to suggest that the fragments come from cell remains that have no nucleus or that they are the result of the decomposition of one or more cells from the embryo itself. The oocyte plays the most important role in fragmentation. Poor oocyte quality can lead to embryos that are highly fragmented. Embryo quality is determined by several characteristics such as the number of cells, their size or if the cell interior has an abnormality of any kind such as granularity or vacuolisation. However, one of the factors that has most impact on embryo quality is the extent of fragmentation. Based on the amount, in percentage, of space that it occupies, fragmentation is categorised into 4 types or degrees. […]

2018-12-17T11:07:30+02:0021 de December de 2018|0 Comments

Is there hope for me following fertilisation failure after ICSI?

In vitro fertilisation treatment (IVF) techniques consist of fertilising oocytes with spermatozoa in a laboratory. They are held under conditions that are similar to their natural environment and, a few days later, the best embryo is selected and placed in the woman’s uterus where it remains until it implants. From this point on, monitoring procedures are the same as in any other spontaneous or natural pregnancy. […]

2018-11-02T14:19:35+02:002 de November de 2018|0 Comments

What is a hysterosalpingography?

A hysterosalpingography is an examination using x-rays and, as its name suggests, it is used for exploring the uterus (hystero-) and fallopian tubes (salpingo-).
The examination is rather uncomfortable but this is remedied by giving the patient some form of pain relief or muscle relaxant before proceeding. An alternative test called a hysterosonography does now exist, too. It is pain free, does not require the use of x-rays and, furthermore, obtains the same results as a hysterosalpingography. Nowadays, hysterosonographies are the preferred choice over hysterosalpingographies. This technique can be performed at Instituto Bernabeu and the results are provided immediately. […]

2018-09-28T09:08:28+02:0028 de September de 2018|0 Comments

How can I help my IVF treatment to work? 10 pieces of advice that may improve your chances

What can I do to get that positive result? How can I help my in vitro fertilisation (IVF) treatment to work? Numerous factors have an impact on the success of in vitro fertilisation and getting pregnant. Living a healthy lifestyle, avoiding toxic habits, using medication appropriately and the following these 10 recommendations and pieces of advice, such as avoiding the use of perfume or ensuring that your bladder is full on the transfer day, may be a great help. […]

2018-09-20T09:19:00+02:0021 de September de 2018|0 Comments

What is oestradiol? What is this sex hormone’s role?

Hormones are messengers that are present in all multicellular organisms – be they animal or plant organisms – that coordinate the functions of each part of that organism.
The sex hormones par excellence are oestradiol in females and testosterone in males. However, the adrenal glands in men and women produce both hormones and they are both necessary for normal development of the two sexes. […]

2018-08-08T14:20:13+02:0010 de August de 2018|0 Comments

What is a mature oocyte?

In the ovary, there are structures known as follicles that contain the oocytes or ova. When a patient undergoes in vitro fertilisation (IVF) treatment, ovarian reserve is one of the most relevant pieces of data and it is evaluated by means of an antral follicle count (follicles that are capable of responding to hormones during stimulation cycle). This information is essential in predicting the number of oocytes we will obtain following ovarian stimulation. Following an ultrasound scan and hormone level checks, the gynaecologist decides when ovulation should be triggered in the patient. […]

2018-07-02T17:29:52+02:006 de July de 2018|0 Comments

IMSI, does it improve the results?

IMSI, or Intracytoplasmic morphologically selected sperm injection, is a technique that became popular over a decade ago.  It uses a very high-power microscope to examine and select the sperm that will then be introduced in the egg with the aim of increasing the possibilities of a successful implantation and reducing the probabilities of miscarriage. […]

2018-03-02T10:25:06+02:002 de March de 2018|0 Comments

How can the best spermatozoon for fertilising an egg be selected?

Selection of the spermatozoon capable of fertilising an egg and generating a viable embryo is a subject that has been covered in a great number of studies aiming to provide this question with an answer.
Although assisted reproduction techniques have been used for dealing with fertility issues for many years, there is still room for improvement in terms of the results obtained. First of all, we need to fully determine the role of the spermatozoon because it tends to be thought of simply as the transporter of the father’s genetic material with no impact on later development. This idea has already been turned on its head and sperm does not only play a role in the fertilisation process. An abnormal spermatozoon can give rise to abnormal embryos and can even influence implantation failure. […]

2017-09-01T14:27:10+02:001 de September de 2017|0 Comments

Ovarian stimulation: What is it? Are there any risks involved?

During the first few days of a period, a complex process takes place in the ovaries. The first step is to gather and initiate development in several follicles that contain eggs. Following this, only one egg is selected and it then develops. A mature egg is released during ovulation.
[…]

2016-05-26T17:43:17+02:0027 de May de 2016|0 Comments
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