1.- Ovarian stimulation in the patient is carried out by administering doses of hormones that stimulate ovarian function with the aim of achieving sufficient oocytes. The doses of the aforementioned hormones are personalised to each patient depending on her ovarian reserve and based on the results of antimullerian hormone levels in a blood test and a follicle count for each ovary using a vaginal ultrasound scan. Controlling each patient’s ovarian response is done over a series of vaginal ultrasound scans (an average of 3) and, in some cases, by checking oestradiol (the hormone produced by the ovary) levels in blood. Once the checks indicate that the ovary is ready, oocyte retrieval is scheduled. This period of ovarian stimulation lasts between 8 and 10 days in most women and does not affect the patient’s daily routine. […]
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. […]
For as long as we can remember, we assume that we belong to certain standards. These standards are set based on the average population, just as children in pediatric check-ups are assessed by a percentile of height and weight. As adults we are assessed by our body mass index. In both cases, we try to reach an “average” rate.
What do we consider average?
This also happens at the embryonic stage. The process of embryo division observation is established to assess whether or not embryos are normal. This observation should be performed at specific times, so that each embryo is observed and evaluated daily.