A general practitioner may refer a patient to a hepatologist for a variety of reasons including drug overdose, gastrointestinal bleeding from portal hypertension, jaundice, ascites, enzyme defects or blood tests that indicateliver diserase. Evidence of diseases in the biliary tree, fever indicating tropical diseases such as hydatid cyst, kala-azar or schistosomiasis may also cause a general practitioner to refer a patient to a hepatologist. These specialists also may treat hemochromatosis or pancreatitis or conduct follow-up among patients who have received a liver transplantation.