Chances of success

Intra-uterine insemination

The chances of getting pregnant after treatment with insemination (sperm from a spouse or donor sperm) in Fertility Medicine at the CHUV are shown in the table below, according to the woman's age.

Clinical pregnancy rate (positive pregnancy test) per insemination cycle (%) and by patient's age.


Woman's age

Intra-uterine insemination

with the partner's sperm

Intra-uterine insemination

with donor sperm



In vitro fertilisation

Since 1st September 2017, the date on which the changes to the Reproductive Medicine Act (RMA) came into force, the culture of blastocysts (embryos at the 5th or 6th day of development) has been our preferred method. 

Thanks to natural selection of embryos and the identification of embryos with the greatest potential for development, the chances of pregnancy and giving birth per transfer cycle have increased. Women may then conceive faster by reducing the number of transfer cycles.

The success rate of an IVF cycle depends on several factors. The patient's age and the causes of infertility are the principle ones. Other elements, such as genetic factors, the quality of the sperm and of the collected egg cells, and the quality and number of fertilised egg cells can affect the success of the treatment.

Clinical pregnancy rate per embryo transfer cycle (%)

The chances of becoming pregnant and having a child after IVF/ICSI treatment in the Fertility Medicine unit at CHUV are shown in the graph below in relation to the woman's age.


Woman's ageFees transfertTransfers after thawing



How to understand these data

We present the data over two years, which avoids bias due to observation over too short a period of time.

Currently, pregnancy rates after thawing are the same or even better than after fresh transfer. Indeed, in the event of a strong response during stimulation (favourable prognostic factor) or an increase in progesterone at the time of initiation, we opt for freezing all the embryos for transfer in the thawing cycle the following month.
This strategy avoids an ovarian hyperstimulation syndrome in the majority of cases.

The pregnancy rate (positive pregnancy test) is not the same as the birth rate because sometimes the pregnancies are not progressive and are spontaneously terminated. The rate of early miscarriage is also related to the age of the woman.

Our team stay naturally at your disposal to discuss these results and your chances.


Fertility Medicine and Gynaecological Endocrinology
CHUV Maternity Unit
Av. Pierre-Decker 2
1011 Lausanne
Fax +41 21 314 32 74
 Last updated on 20/04/2020 at 16:30