title: [Alterations in laboratory tests as predictors of choledocholithiasis in patients who underwent ERCP: experience in a national private center].
abstract: BACKGROUND
  ERCP is very important in the management of common bile duct stones but it has associated morbidity.
  
  
  METHODS
  We analyze retrospectively records of 293 patients with suspected CBD stones to determine laboratory predictors of the pathology and improve the selection of patients for the examination. Sensitivity, specifity, predictive positive value and predictive negative value were calculated for alkaline phosphatase (FA), Total Bilirrubin (BT), TGO(AST) and TGO(ALT). We also compared values between patients with and without gallbladder suffering CBD stones confirmed by ERCP.
  
  
  RESULTS
  293 patients had ERCP. 247 had CBD stones and 46 had no stones. OF the CBD stones group 58(23%) didn't have gallbladder and 187(77%) had gallbladder. Hepatic function tests FA, TGP y BT where all pronostic factors for CBD stones on univariate analysis with statistical value of p<0.01. Clinical presentation was not included in analysis. Age, TGO(AST) and GGTP didn't showed statistical significance.
  
  
  CONCLUSIONS
  The predictors of CBD stones have better results when combined. The use of stricter selection criteria can reduce the number of normal exams and complications.
authors.affiliation: Unidad de Endoscopia Terapéutica, Servicio de Gastroenterología, Clínica Ricardo Palma, Lima, Perú.
authors.forename: Simón
authors.initials: S
authors.lastname: Yriberry Ureña
authors.forename: Victor
authors.initials: V
authors.lastname: Monge Zapa
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002760:Cholangiopancreatography, Endoscopic Retrograde; D003955:Diagnostic Tests, Routine; D005260:Female; D042882:Gallstones / Q000175:diagnosis*; D006801:Humans; D007753:Laboratories; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies