pH of sweat of patients with cystic fibrosis.

pH of the sweat from patients with cystic fibrosis and in controls 
was measured as a function of the sweat-rate using a fluorescence-pH- 
indicator (umbelliferone). In both populations sweat is acid at low sweat-rates 
and alkaline at high ones. The results do not favour an 
abnormality of the ductal H+-secretion as the pathomechanism of cystic fibrosis. 
