Implementation of the new Swiss law

02 october 2017

On September 1, 2017, modifications of the Swiss Law on Medically Assisted Procreation (LPMA) were implemented. This amendment of the law was accepted by the people on June 5, 2016 with 64% of the vote.

The LPMA now allows the genetic diagnosis of embryos before transfer into the uterus.Preimplantation genetic diagnosis (PGD, or DPI in French) is reserved for couples who carry a severe genetic abnormality.The preimplantation diagnosis of aneuploidy (DPI-A), also called "preimplantation screening" (PGS), is reserved for infertile couples with a higher risk of developing embryos with a chromosome abnormality (eg history of miscarriages, woman's age over 38 years, etc.).

The alternatives to PGD are prenatal diagnosis, treatment by donation or adoption.

However, other very important changes have also been accepted and are summarized in the table below  :

Modifications Previous Law Current Law
Preimplantation diagnosis not allowed authorized
Maximum number of embryos in culture 3 12
Cryopreservation of embryos not allowed authorized

Duration of conservation (gametes,

zygotes,embryos)

5 years 10 years


These changes allow us to identify the embryos most likely to implant in the uterus and to start a pregnancy, by allowing them to evolve in the embryoscope until the 5th day of development (blastocyst stage). In most situations, only one embryo will be transferred into the uterus. This is in order to limit twin pregnancies, which are always more at risk for the babies and the mother.
The supernumerary blastocysts will be frozen by vitrification.

With this new law, the Swiss clinics that obtain the prerequisite cantonal authorizations, have access to the majority of possibilities for medically assisted procreation offered in neighboring countries (exception: oocyte donation is still prohibited in Switzerland).

The CPMA welcomes the fact that in the context of assisted reproductive technologies (ART), blastocyst transfers make it possible to shorten the duration of treatments and to reduce the costs per pregnancy obtained.

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CPMA, Rue de la Vigie 5, 1003 Lausanne, tél: 021 321 15 80