According to the majority opinion, preimplantation genetic diagnosis should be “permitted exceptionally

a) for couples at high risk of having a child with a severe genetic condition or disability that cannot be effectively treated, and who would be confronted with an existential conflict if a child affected by such a condition or disability were carried to full term;

b) for couples at high risk of transmitting a chromosomal disorder as a result of which the embryo would not reach the stage of extrauterine viability [...];

c) for infertile couples if scientific investigation shows that the success rate of sterility treatment in certain patient groups (e.g. older women or women who have undergone a number of unsuccessful treatment cycles without a known chromosomal disorder) can be significantly increased and the number of embryos transferred can be reduced – together with the risk of multiple pregnancies – by a test for chromosomal disorders." Moreover, the diagnosis "must be preceded by appropriate counselling, covering not only medical and ethical but also psychosocial aspects." The performance of PGD should be confined to "a small number of licensed centres whose licences are subject to revocation" and governed by procedural rules that ensure "conformity with the indication, the quality of application and scientific back-up and evaluation, combined with adequate transparency, subject to the observance of professional secrecy and data protection requirements." In addition, "central documentation and monitoring" must be guaranteed.