Choledocholithiasis is a disease that requires a suitable approach to determine their management given the possible complications of omission in his diagnosis or therapeutic procedures. Endoscopic retrograde cholangiopancreatography (ERCP) is an option in their management, but is an invasive procedure with risks of significant morbidity and mortality. The aim of this study is to determine the correlation between the results of serological tests, found the diameter of the bile duct by ultrasound, and radiological diagnosis of choledocholithiasis and procedures performed in the University Hospital of the Samaritan woman (HUS) from 01 / 05/2009 and 31/08/2010. Materials and Methods: concordance of diagnostic tests. Where through the collection of information through a questionnaire to identify patients with a presumptive diagnosis of choledocholithiasis, serological results, sonographic findings of the bile duct and reporting of ERCP was performed a descriptive analysis of the population, were calculated sensitivity, specificity and likelihood ratios, and to determine the degree of concordance between the tests using the statistical software Stata v. 11 (StataCorp, TX, USA) and SPSS v. 18 (SPSS Inc., Ill., USA) Given the current evidence is any indicator used only (medical history, ultrasound, serum markers) is able to determine the diagnosis of choledocholithiasis with sufficient precision, but in older patients whose clinical picture suggests obstructive biliary disease, there are some cut-off points are of algorithms in the literature, which are a guide to determine the need for ERCP and can be used at our institution.