Below is a list of the 24 common mutations for which carrier testing, prenatal and newborn screening is conducted. These are listed numerically and alphabetically, and not frequency of occurrence.
Interestingly, the DeltaF508 mutation is the most common mutation worldwide. This is why a majority of cystic fibrosis patients have 2 copies of the delta F508 gene—one from each carrier parent.
For more information and a complete list of the statistics of ethnicity/region and CF mutations, visit http://www.genet.sickkids.on.ca/cftr/resource/rptTable1Full.html