Approximately 30,000 people in the United States are living with Cystic Fibrosis (CF), according to the Cystic Fibrosis Foundation. CF occurs at increased frequency in Caucasians and individuals of Ashkenazi Jewish descent, but can occur in any ethnic group. It is a disorder of mucus production, primarily affecting the pulmonary, gastrointestinal and reproductive systems. Although there is some variability of clinical expression, most individuals with CF require lifelong medical care and experience reduced life expectancy. Couples who are planning a pregnancy or who are already pregnant may decide to have testing to find out if they are carriers and at risk of having a baby with CF. It is standard of care to offer carrier screening for CF to Caucasian and Ashkenazi Jewish individuals and to inform couples of other ethnic backgrounds of CF testing. If both parents are found to be carriers, prenatal diagnosis by CVS or amniocentesis is available.