The pregnancy rate after a IVF cycle depends on many factors, mainly on the infertility of one or both members of the couple. These are approximate indications of the success rate of this technique, that is, the likelihood of getting pregnant and of giving birth to a baby after an in vitro fertilisation cycle:
- 40% in women under the age of 35.
- Between 27-36% in women of age 35 to 37.
- Between 20-26% in women of age 38 to 40.
- Between 10-13% in women over the age of 50.
It is also important to take into account that this information changes depending on the fertility clinic where the treatment is performed. As can be seen in pregnancy rates, the age of the woman is a limiting factor, since in older women the reproductive potential of the woman decreases.
Pregnancy rates also change depending on the origin of eggs and sperm with which in vitro fertilisation is performed. If it is performed with her own eggs and partner’s sperm the chance of success is lower, since from the age of 35 oocyte quality usually deteriorates a lot. If donated eggs are used, the chance of success increases a lot, almost to 45%. In this case the age of the recipient woman does not affect, since donors are younger than 35 years and have good quality oocytes. If donor semen is used chances can also increase, since it guarantees good quality sperm cells and they are more likely to fertilise the oocytes.