Statistical value of various clinical parameters in predicting the presence of choledochal stones.

Persistent choledochal stones, as well as negative choledochal explorations, lead to increased morbidity and expense in operations upon the biliary tract. In an attempt to establish more precise criteria for the presence of CBD stones, 1,000 consecutive cholecystectomies were studied and computer analyzed. Precise determination of the choledochal diameter and preoperative bilirubin levels permit a quite accurate estimate of the probable presence of a choledochal stone.