Im. Doughty et al., DELAYED DIAGNOSIS OF CYSTIC-FIBROSIS DUE TO NORMAL SWEAT ELECTROLYTES, Journal of the Royal Society of Medicine, 88(7), 1995, pp. 417-418
The sweat test, if properly performed, is a reliable tool to assist in
the diagnosis of cystic fibrosis. In practice, most errors arise from
false positive results(1,2). This case serves as a reminder that fals
e negatives may also occur.