title: Delayed diagnosis of cystic fibrosis due to normal sweat electrolytes.
abstract: 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. This case serves as a reminder that false negatives may also occur.
authors.affiliation: Department of Child Health, University of Manchester, England, UK.
authors.forename: I M
authors.initials: IM
authors.lastname: Doughty
authors.forename: I
authors.initials: I
authors.lastname: Ward
authors.forename: M
authors.initials: M
authors.lastname: Schwarz
authors.forename: T J
authors.initials: TJ
authors.lastname: David
mesh_terms: D002712:Chlorides / Q000032:analysis; D003550:Cystic Fibrosis / Q000175:diagnosis*; D004573:Electrolytes / Q000032:analysis*; D005188:False Negative Reactions; D005500:Follow-Up Studies; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D011188:Potassium / Q000032:analysis; D012964:Sodium / Q000032:analysis; D013542:Sweat / Q000737:chemistry*
chemical_list: D002712:Chlorides; D004573:Electrolytes; D012964:Sodium; D011188:Potassium