Detection of cystic fibrosis heterozygotes using the zeta potential reduction method.

Parotid saliva samples from cystic fibrosis homozygotes, heterozygotes and normal individuals were 
tested by the zeta potential technique for secretion factor in a 
double-blind experiment. There was no overlap between zeta potential reduction of 
the control group and the cystic fibrosis test groups, indicating that 
the zeta potential test may be detecting a unique component in 
saliva of cystic fibrosis genotypes. 