Identify the defining serologic or biochemical marker that is most specific for diagnosing each of the following hepatobiliary conditions.
- Primary biliary cholangitisPositive anti-mitochondrial antibodies (AMA)
- Primary sclerosing cholangitisPositive perinuclear anti-neutrophil cytoplasmic antibodies (p-ANCA) and biliary stricturing
- Autoimmune hepatitisPositive anti-smooth muscle antibodies (ASMA) and elevated IgG
- Hereditary hemochromatosisSignificantly elevated transferrin saturation and HFE gene mutation
Answer
Primary biliary cholangitis matches with anti-mitochondrial antibodies. Primary sclerosing cholangitis matches with p-ANCA. Autoimmune hepatitis matches with anti-smooth muscle antibodies. Hereditary hemochromatosis matches with elevated transferrin saturation and HFE gene mutation.
Each hepatobiliary disorder has a distinct pathophysiologic signature. Primary biliary cholangitis specifically targets intrahepatic ducts and is AMA-positive. Primary sclerosing cholangitis targets the entire biliary tree, causes stricturing, and is often p-ANCA positive. Autoimmune hepatitis is hepatocellular and ASMA-positive. Hereditary hemochromatosis is an iron metabolism disorder identified by high transferrin saturation and confirmed by HFE genotyping.
Step-by-Step Solution
Key Concept
Autoantibodies and biochemical markers in hepatobiliary diseases
Estimated Time:45s