Fatty liver is a common cause of hepatomegaly of unknown etiology. In uncomplicated fatty liver, function tests are variable. There may be no abnormality at all. ALP levels in one series were elevated in nearly 48% of patients but usually were less than twice normal. An elevated AST level is found in 40% of patients, usually less than 5 times normal, and more often with severe degrees of fatty metamorphosis. The serum bilirubin level may be elevated in 35% of patients, but most have minimal abnormality, usually less than twice normal and without jaundice. Severe fatty liver may present clinically with jaundice, but this is very uncommon.