title: [Combined use of tandem mass spectrometry with urine gas chromatography/mass spectrometry is useful for diagnosis of inborn errors of metabolism in children].
abstract: OBJECTIVE
  Many inborn errors of metabolism have similar presenting clinical manifestations, making early diagnosis difficult. We report our experience with tandem mass spectrometry combined with urine gas chromatography/mass spectrometry as a means of definitively diagnosing inborn errors of metabolism.
  
  
  METHODS
  One hundred and thirty-two children with suspected inborn errors of metabolism but without specific clinical manifestations, admitted to the Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine between June 1, 2003 and September 30, 2006, were studied. Children received routine biochemical examinations, as well as mass spectrometry and gas chromatography-mass spectrometry.
  
  
  RESULTS
  Fifteen cases (11.5%) were confirmed as having inborn errors of metabolism, including 6 cases of methylmalonic acidemia, 2 of propionic academia, 2 of Type II citrullinemia, 1 of biotinidase deficiency, 1 of tyrosinemia, 1 of maple syrup urine disease, 1 of omithine transcarbamylase deficiency and 1 of very long chain Acyl CoA dehydrogenase deficiency.
  
  
  CONCLUSIONS
  The combined use of tandem mass spectrometry with urine gas chromatography mass spectrometry is useful for early diagnosis of inborn errors of metabolism in children with suspected inborn errors of metabolism but without specific clinical manifestations.
authors.affiliation: Department of Pediatrics, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200092, China.
authors.forename: Li-Juan
authors.initials: LJ
authors.lastname: Xie
authors.forename: Jian-Xing
authors.initials: JX
authors.lastname: Zhu
authors.forename: Xiao-Dong
authors.initials: XD
authors.lastname: Zhu
authors.forename: Hua-Jun
authors.initials: HJ
authors.lastname: Li
authors.forename: Lian-Shu
authors.initials: LS
authors.lastname: Han
authors.forename: Xue-Fan
authors.initials: XF
authors.lastname: Gu
mesh_terms: D000592:Amino Acid Metabolism, Inborn Errors / Q000175:diagnosis; D002648:Child; D002675:Child, Preschool; D005260:Female; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008052:Lipid Metabolism, Inborn Errors / Q000175:diagnosis; D008297:Male; D008661:Metabolism, Inborn Errors / Q000175:diagnosis* / Q000652:urine; D053719:Tandem Mass Spectrometry / Q000379:methods*