title: [Standardized sweat chloride analysis for the diagnosis of cystic fibrosis in Korea].
abstract: BACKGROUND
  Cystic fibrosis is a chronic progressive autosomal recessive disorder caused by the CFTR gene mutations. It is quite common in Caucasians, but very rare in Asians. Sweat chloride test is known to be a screening test for the cystic fibrosis due to the fact that electrolyte levels in sweat are elevated in patients. In this study, sweat chloride levels in Korean population were measured and analyzed by using standardized pilocarpine iontophoresis sweat chloride test.
  
  
  METHODS
  The sweat chloride test was performed in 47 patients referred to Yondong Severance Hospital from August, 2001 to April, 2007 and 41 healthy volunteers. The sweat chloride tests were conducted according to the CLSI C34-A2 guideline using pilocarpine iontophoresis method, and the chloride concentrations in sweat were measured by mercurimetric titration.
  
  
  RESULTS
  Four patients showed sweat chloride concentrations higher than 60 mmol/L. Reference interval was calculated as 1.4-44.5 mmol/L by analysis of the results of healthy volunteers (n=41). Four patients who exhibited high sweat chloride levels, had characteristic clinical features of cystic fibrosis and their diagnoses were confirmed either by repeated sweat chloride test or genetic analysis.
  
  
  CONCLUSIONS
  Standardized sweat chloride test can be utilized as a useful diagnostic tool for cystic fibrosis in Koreans. In cases of sweat chloride levels higher than 40 mmol/L, the test should be repeated for the possible diagnosis of cystic fibrosis. All the confirmed Korean cases of cystic fibrosis showed sweat chloride level above 60 mmol/L.
authors: Department of Laboratory Medicine, Yonsei University College of Medicine, Seoul, Korea.
authors: Sue Jung
authors: SJ
authors: Kim
authors: Mingoo
authors: M
authors: Lee
authors: Seung-Ick
authors: SI
authors: Cha
authors: Hwa Young
authors: HY
authors: Park
authors: Kang Mo
authors: KM
authors: Ahn
authors: Chang-Seok
authors: CS
authors: Ki
authors: Jeong-Ho
authors: JH
authors: Kim
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D002712:Chlorides / Q000032:analysis* / Q000592:standards*; D003550:Cystic Fibrosis / Q000175:diagnosis* / Q000235:genetics; D005260:Female; D006801:Humans; D007223:Infant; D007478:Iontophoresis / Q000379:methods; D007723:Korea; D008297:Male; D008875:Middle Aged; D010862:Pilocarpine / Q000737:chemistry; D017422:Sequence Analysis, DNA; D013542:Sweat / Q000737:chemistry / Q000378:metabolism*
chemical_list: D002712:Chlorides; D010862:Pilocarpine