Elevated Vitamin B12 and Liver Disease

Diagnostic Considerations

• The American College of Radiology recommends considering various causes of liver disease based on the pattern of elevation (hepatocellular vs. cholestatic) when evaluating abnormal liver tests 1
• Common causes of mild aminotransferase elevations include non-alcoholic fatty liver disease, alcohol-induced liver disease, drug-induced liver injury, and viral hepatitis, rather than vitamin B12 elevation 1

Clinical Approach

• Initial evaluation of abnormal liver tests should include a detailed history, medication inventory, and physical examination 2
• When assessing elevated liver enzymes, clinicians should determine if the pattern is predominantly hepatocellular (elevated alanine transaminase/aspartate transaminase) or cholestatic (elevated alkaline phosphatase) 1
• For mild aminotransferase elevations, ultrasound is recommended as a first-line investigation tool 1

Biomarkers and Risk Assessment

• Elevated serum tryptase and/or vitamin B12 levels are commonly observed in myeloproliferative variants of hypereosinophilia, particularly in myeloid neoplasms with PDGFRA fusion gene 3

Important Clinical Considerations

• When evaluating abnormal liver tests, the pattern of abnormality (hepatocellular vs. cholestatic) and the magnitude of elevation are more important diagnostic indicators than vitamin B12 levels 1, 2
• The interpretation of abnormal liver chemistries must always be considered in the clinical context of the individual patient 2