- Patients who test positive for hepatitis C antibody (Ab) are eligible provided all of the following criteria are met: 1) total bilirubin =< 2 x upper limit of normal; 2) AND aspartate aminotransferase (AST) =< 3 x upper limit of normal; AND 3) liver biopsy (pathology) demonstrates =< grade 2 fibrosis and no cirrhosis