Prenatal screening for carriers of cystic fibrosis should screen both partners individually.

EDITOR,—Screening of pregnant women for mutations in the transmembrane conductance regulator gene for cystic fibrosis is under way in several regions. During the past few years, several papers have been published about such screening, which causes problems.1 2 On the basis of a carrier frequency of 4% in the general population and a feasible rate of detection of mutations of 85%, one can calculate the proportion of …