Reproductive biology
Discover in depth the biological processes related to fertilization, embryo implantation and all aspects affecting human reproductive biology.
Spermatozoa production takes place in the testicular seminiferous tubules and the process is known as spermatogenesis. At the end of this process, a germ cell generates 4 mature spermatozoa which will survive in the human body for between […]
Asthenozoospermia is a decrease in the percentage of motile sperm in a sperm sample and it is identified by means of a seminogram or semen analysis. Nowadays, seminograms are a basic tool which provide us with information […]
How are seminograms interpreted?
A seminogram, or semen analysis, is a basic analysis of a semen sample with the aim of determining semen quality. In order to carry out the analysis correctly, the patient needs to refrain from sexual intercourse for […]
Oligozoospermia and criptozoospermia
Oligozoospermia is the presence of an abnormally low number of sperm in a semen sample. According to the criteria in the 5th edition of the World Health Organisation (WHO) manual, normal sperm content in a sample […]
A boy or a girl: can I choose my baby’s gender?
Whilst it is technically possible to choose a child’s gender using pre-implantation genetic diagnosis, Spanish law prohibits selecting a baby’s sex, except with a view to avoiding the transmission of genetic diseases associated with the X chromosome. […]
Techniques for obtaining spermatozoa
There are currently many different solutions when spermatozoa are not present in ejaculate. Access to a trained urologist increases chances of achieving spermatozoa in greater quantities and with improved quality. What is TESA (Testicular Sperm Aspiration)? This […]
ACCESS INFORMATION PRIOR TO THIS POST ON BETA β-hCG (human chorionic gonadotropin) is a glycoprotein that is initially secreted by trophoblast cells in the embryo shortly after it implants in the uterus. The rapid increase […]
Embryo transfer on day 3 or day 5. The pros and cons.
Determining the ideal day for embryo transfer has always been a controversial issue and there are, even today, still a number of doubts surrounding this issue. Embryo culture is, basically, a selection process. Each embryo’s […]
Obesity and embryo implantation failure
It has long been known that patients who are overweight face increased reproduction and pregnancy loss issues. Issues achieving a successful pregnancy are even greater if, as well as being obese, the patient also has […]
Recurrent pregnancy loss: an issue that does have a solution
Clearly one of the most difficult situations a couple trying for children may have to face is pregnancy loss. Suffering is even greater when, prior to this, the couple has gone through fertility treatment such […]