This work consists of the study of 320 cases in which have investigated the hepatobiliary function by a "battery" of tests consisting in the analysis of a single blood sample; such a procedure does not cause discomfort to the patient, provides time saving, and has proved very useful for the differential diagnosis, prognosis and treatment of diseases of the liver and bviliares way. Additional functional tests Hepatobiliary have been applied to Carrión's disease, showing concomitant hepatitis.