Being identified as a carrier is common; most people carry at least one pathogenic variant for some recessive condition, and this is not expected to affect the carrier’s own health. The more significant question is what happens when both members of a couple are found to be carriers for changes in the same gene, since this substantially raises the chance of having an affected child.

• Autosomal recessive conditions When both partners are carriers of changes in the same gene, each pregnancy they conceive together has a twenty-five percent chance that the child inherits both non-working copies and is affected, a fifty percent chance the child is an unaffected carrier like the parents, and a twenty-five percent chance the child inherits neither non-working copy.
• X-linked conditions If a woman is found to be a carrier, each son has an increased chance of being significantly affected and each daughter has an increased chance of also being a carrier; the exact chances depend on the specific condition and inheritance pattern involved.
• Genetic counseling Couples identified as being at increased risk together are typically referred for genetic counseling, where the specific condition, its severity, its variability, and the accuracy of the test results can be discussed in detail.
• Reproductive options May include prenatal diagnostic testing during a pregnancy, such as chorionic villus sampling or amniocentesis, to determine whether a particular pregnancy is affected; preimplantation genetic testing performed on embryos created through in vitro fertilization, allowing selection of embryos that have not inherited both non-working copies; use of a donor egg or sperm; adoption; or proceeding with pregnancy while being prepared, through knowledge gained from testing, for the possibility of an affected child.
• Informed decision-making Differences in perspective, both among medical professionals and within families, exist regarding the use of these various reproductive options, and most healthcare professionals consider the choice among them to be a personal decision best made by the couple themselves after full discussion of the relevant facts.