Ultrasound. A new diagnostic approach to the jaundiced patient.

Evaluation of the jaundiced patient's condition frequently can be difficult. Clinical history, physical examination, liver function tests, and other laboratory data are often inconclusive in differentiating extrahepatic obstruction (surgical jaundice) form intrahepatic cholestasis (medical laundice). During a 14-month period, we have evaluated 40 cases of jaundice of unknown causes. Ultrasound was able to correctly diagnose pathologically proved extrahepatic obstruction in 23 of 24 patients and intrahepatic cholestasis in 15 of 16 patients. There was one false-positive and one false-negative result in this series.