Expanded carrier screening constitutes a new scientific tool able to detect conditions that can be treated immediately after birth or during pregnancy. Its implementation could affect both the prenatal period and assisted reproductive techniques. It is strongly beneficial as it provides much useful information to future parents concerning the medical status of their offspring. In addition, the definition of ‘serious/severe’, regulating preimplantation diagnosis, donor insemination, and even the definitions of prerequisites for abortion diseases, should be reformed including all clinically severe diseases. On the other hand, controversies may arise especially regarding gamete donation. Future parents and offspring maybe informed regarding donors’ demographic and medical characteristics. This study aims to investigate the effects of the implementation of expanded carrier screening in the reformation of the definition of ‘severe/serious’ disease, the decision-making of future parents, gamete donation, and the possible new moral dilemmas that may arise.