title: [Value of the liver function test in differential diagnosis of infantile hepatitis syndrome and biliary atresia].
abstract: OBJECTIVE
  This study aimed to investigate the value of the liver function test in the differential diagnosis of infantile hepatitis syndrome (IHS) and biliary atresia (BA) by analyzing seven conventional serological markers in this test using receiver operating characteristic (ROC) curves.
  
  
  METHODS
  Serum levels of seven conventional serological markers: alanine aminotransferase (ALT), aspartate aminotransferase (AST), gamma-glutamyl transpeptidase (gamma-GT), alkaline phosphatase (ALP), total bilirubin (TB), conjugated bilirubin (CB) and serum albumin (ALB) were measured in 103 children with IHS and 60 children with BA. ROC curves were used to evaluate the sensitivity, specificity, positive and predictive values and optimal cut-off. The united tests (parallel test and serial test) of gamma-GT, TB and CB were performed to elevate diagnostic efficiency.
  
  
  RESULTS
  Compared with the IHS group, the BA group had significantly increased serum ALT, AST, gamma-GT, TB and CB levels (p<0.01). The area under ROC (AUCROC) of AST, gamma-GT, CB and TB was 0.77, 0.881, 0.841 and 0.87, respectively. gamma-GT showed the highest AUCROC, specificity, positive predictive value and positive likelihood ratio in the diagnosis of BA, followed by CB, TB and AST in turn. The negative predictive value of CB was the highest, followed by TB. The negative likelihood ratio of CB was the lowest but its Youden index was the highest. The Youden index of gamma-GT and TB was lower than that of CB. After the parallel tests, the sensitivity and negative predictive value of gamma-GT, CB and TB increased to 100%. After the serial tests, the specificity of gamma-GT, CB and TB increased to 90.4% and the positive predictive value increased to 87.5%.
  
  
  CONCLUSIONS
  The measurement of gamma-GT, TB and CB levels are valuable in the differential diagnosis of BA and IHS. An imaging examination is required in the parallel test positive patients.
authors.affiliation: Department of Gastroenterology, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiaotong University, Shanghai 200127, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Chu
authors.forename: Li-rong
authors.initials: LR
authors.lastname: Jiang
authors.forename: Sha
authors.initials: S
authors.lastname: Zhou
authors.forename: Ya-zhen
authors.initials: YZ
authors.lastname: Xu
authors.forename: Bin
authors.initials: B
authors.lastname: Zhang
authors.forename: Zhao-hui
authors.initials: ZH
authors.lastname: Deng
mesh_terms: D000410:Alanine Transaminase / Q000097:blood; D001219:Aspartate Aminotransferases / Q000097:blood; D001656:Biliary Atresia / Q000097:blood / Q000175:diagnosis*; D001663:Bilirubin / Q000097:blood; D003937:Diagnosis, Differential; D005260:Female; D006505:Hepatitis / Q000097:blood / Q000175:diagnosis*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008111:Liver Function Tests; D008297:Male; D012372:ROC Curve; D005723:gamma-Glutamyltransferase / Q000097:blood
chemical_list: D005723:gamma-Glutamyltransferase; D001219:Aspartate Aminotransferases; D000410:Alanine Transaminase; D001663:Bilirubin