title: Value of gamma-glutamyl transpeptidase for early diagnosis of biliary atresia.
abstract: BACKGROUND
  Early diagnosis of congenital biliary atresia (BA) is important because the prognosis is closely related to timing of a hepaticoportoenterostomy. In this study, we discuss whether the elevation of serum gamma-glutamyl transpeptidase (GGT) is accurate for the early differentiation of BA from neonatal hepatitis (NH).
  
  
  METHODS
  The effectiveness of using GGT before the age of 10 weeks and other tools in the differential diagnosis of BA and NH were analyzed retrospectively by reviewing the charts of 29 BA and 12 NH patients. The results of serial liver enzyme studies, abdominal sonography, hepatobiliary scintigraphy and transcutaneous liver biopsy were compared between both groups.
  
  
  RESULTS
  The peak GGT value in BA before 10 weeks of age was significantly higher than that in NH (622.5 +/- 211.9 U/l vs 168.8 +/- 100.3 U/l, respectively, p < 0.001). When a serum GGT concentration greater than 300 U/l was used as a diagnostic criterion for BA in patients younger than 10 weeks of age, the diagnostic accuracy was 85%. When an increase in GGT value (in serial measurements) of greater than 6 U/l/day was used as a criterion, the accuracy was 88%. The diagnostic accuracy of abdominal sonography, hepatobiliary scintigraphy and liver biopsy was 68%, 67% and 79%, respectively.
  
  
  CONCLUSIONS
  GGT concentration is diagnostically valuable when the results of other diagnostic methods are not available, or are controversial, in differentiating between BA and NH.
authors.affiliation: Department of Surgery, Veterans General Hospital-Taipei, National Yang-Ming University School of Medicine, Taiwan, ROC.
authors.forename: C S
authors.initials: CS
authors.lastname: Liu
authors.forename: T W
authors.initials: TW
authors.lastname: Chin
authors.forename: C F
authors.initials: CF
authors.lastname: Wei
mesh_terms: D001656:Biliary Atresia / Q000175:diagnosis*; D004796:Clinical Enzyme Tests; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D005723:gamma-Glutamyltransferase / Q000097:blood*
chemical_list: D005723:gamma-Glutamyltransferase