title: The role of serum liver enzymes in the diagnosis of choledocholithiasis.
abstract: OBJECTIVE
  The introduction of laparoscopic cholecystectomy has increased the need for preoperative diagnosis of common bile duct stones. The purpose of this study is to verify the sensitivity of the liver function tests in the detection of duct stones.
  
  
  METHODS
  We evaluated 438 patients (223 retrospectively and 215 prospectively) who underwent endoscopic papillotomy for bile duct stones in two different services. In every case, blood samples for liver function tests levels were collected prior to endoscopic retrograde cholangiopancreatography.
  
  
  RESULTS
  The most sensitive test was gamma-glutamyl transpeptidase, that was abnormal in 92.2% of the cases. Alkaline phosphatase was elevated in 74.7% of the patients with choledocholithiasis. The least sensitive parameter was AST, altered in only 50.8% of times. The sensitivity of all liver tests for the diagnosis of choledochal stones taken together was 94.3%.
  
  
  CONCLUSIONS
  Liver function tests are very sensitive in the detection of common bile duct stones, however these blood tests are in the normal range of about 5% of endoscopically treated patients.
authors.affiliation: Department of Medicine C (Gastroenterology), Klinikum der Stadt Ludwigshafen gGmbH Academic Teaching Hospital, University of Mainz, Germany.
authors.forename: J C
authors.initials: JC
authors.lastname: Pereira-Limâ
authors.forename: R
authors.initials: R
authors.lastname: Jakobs
authors.forename: J V
authors.initials: JV
authors.lastname: Busnello
authors.forename: C
authors.initials: C
authors.lastname: Benz
authors.forename: C
authors.initials: C
authors.lastname: Blaya
authors.forename: J F
authors.initials: JF
authors.lastname: Riemann
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000469:Alkaline Phosphatase / Q000097:blood; D015415:Biomarkers / Q000097:blood; D004796:Clinical Enzyme Tests; D005260:Female; D042882:Gallstones / Q000097:blood / Q000175:diagnosis* / Q000201:enzymology* / Q000601:surgery; D006801:Humans; D008099:Liver / Q000201:enzymology; D008111:Liver Function Tests; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D012680:Sensitivity and Specificity; D016717:Sphincterotomy, Endoscopic; D005723:gamma-Glutamyltransferase / Q000097:blood
chemical_list: D015415:Biomarkers; D005723:gamma-Glutamyltransferase; D000469:Alkaline Phosphatase