Fertility in a man with cystic fibrosis.

Our patient had well-compensated and late-appearing cystic fibrosis manifested by moderately decreased 
exercise, tolerance and a normal semen analysis, and he had presumably 
fathered one child. It is important to again emphasize the physician's 
obligation to determine fertility in any male cystic fibrosis patient, particularly 
with late-onset of symptoms, and to provide appropriate genetic counseling. 