• * The center of assisted medical procreation of the CHU St Pierre is specialised in reproductive medicine. Reference center: quality label ISO 9001 obtained in 2008 and accredited by the AFMPS (Agence Fédérale des Médicaments et Produits de Santé).

Good quality supernumerary embryos can be frozen. Freezing can be carried out at every stage of embryo development.


Freezing and thawing embryos

The freezing technique used in the laboratory is vitrification, an ultra-rapid freezing technique.

These embryos are stored in tanks containing liquid nitrogen on a permanent basis (-196°C).

The embryos won’t deteriorate over time but some embryos don’t survive the technique (approximately 10%). Belgian law imposes a maximum preservation period of 5 years that can be renewed every year after this deadline.


Embryos are thawed the day before or on the morning of the transfer.

Pregnancies resulting from frozen embryos are no different from those resulting from a transfer of non-frozen embryos and there are no additional abnormalities in the unborn child. The pregnancy rate following the transfer of frozen embryo(s) is 50%.


Plan du site CHU Saint Pierre - Bâtiment 200, 5è étage . Département de Gynécologie-Obstétrique

Centre de Fécondation In vitro - 322, Rue Haute - Bruxelles Tel +32(0)2 535 3406 Fax +32(0)2 535 3409