Chronic hepatitis is suspected in patients with any of the following: Suggestive symptoms and signs Incidentally noted elevations in aminotransferase levels Previously diagnosed acute hepatitis In addition, to identify asymptomatic patients, the Centers for Disease Control (CDC) recommends testing of all adults ≥ 18 years at least once for hepatitis C Liver tests Liver tests are needed if not previously done and include serum alanine aminotransferase (ALT), aspartate aminotransferase (AST), alkaline phosphatase, and bilirubin.