Evaluation and Management of Mild Hepatocellular Injury

Classification and Causes of Elevation

The American College of Radiology indicates that mildly elevated AST and ALT levels represent a mild aminotransferase elevation (<5 times the upper limit of normal) 1
The AST/ALT ratio is approximately 1.1, which is not suggestive of alcoholic liver disease (which typically has a ratio >2), as suggested by the American Association for the Study of Liver Diseases 2, 3
Nonalcoholic fatty liver disease (NAFLD) is the most common cause of mild aminotransferase elevation in developed countries, associated with obesity, diabetes, and metabolic syndrome, according to the American College of Radiology 1
Alcoholic liver disease typically shows an AST/ALT ratio >2, often >3, as indicated by the American Association for the Study of Liver Diseases 2, 3

A detailed history focusing on alcohol consumption patterns, current medications, and risk factors for viral hepatitis is recommended by the American Gastroenterological Association 2, 3, 4
Physical examination should focus on signs of chronic liver disease and hepatomegaly, as suggested by the American Association for the Study of Liver Diseases 2, 3
Initial laboratory testing should include complete blood count, comprehensive metabolic panel, hepatitis B and C serologies, and gamma-glutamyl transferase, as recommended by the American College of Radiology 1, 8
Ultrasound of the abdomen is the recommended first-line imaging test to assess for fatty liver, hepatomegaly, and rule out biliary obstruction, according to the American College of Radiology 1

For NAFLD, lifestyle modifications including weight loss, increased physical activity, and dietary changes are recommended by the American Association for the Study of Liver Diseases 1, 5
For medication-induced liver injury, consideration of discontinuation of suspected hepatotoxic medications and repeat liver enzymes after 2-5 days is suggested by the American Gastroenterological Association 4, 9, 10
Follow-up monitoring with repeat liver enzymes in 4-6 weeks to assess trends is recommended by the American College of Radiology 1, 10

Persistent elevation of aminotransferases despite initial management, evidence of advanced liver disease, suspected autoimmune hepatitis or hereditary liver disease, or AST or ALT levels that increase to >3× ULN on follow-up are indications for referral to a specialist, as suggested by the American Association for the Study of Liver Diseases and the American College of Radiology 1, 5, 6, 9, 10