A 36-year-old woman has become increasingly icteric for 1 month. She has had several bouts of colicky, midabdominal pain for 3 years. On physical examination, she has generalized jaundice with scleral icterus. Her BMI is 32. There is tenderness in the right upper quadrant, and the liver span is normal. A liver biopsy is obtained, and microscopic examination shows bile duct proliferation and intracanalicular bile stasis, but no inflammation or hepatocyte necrosis. The level of which of the following is most likely to be increased in the patient’s serum?
A 36-year-old woman has become increasingly icteric for 1 month. She has had several bouts of colicky, midabdominal pain for 3 years. On physical examination, she has generalized jaundice with scleral icterus. Her BMI is 32. There is tenderness in the right upper quadrant, and the liver span is normal. A liver biopsy is obtained, and microscopic examination shows bile duct proliferation and intracanalicular bile stasis, but no inflammation or hepatocyte necrosis. The level of which of the following is most likely to be increased in the patient’s serum?
💡 Explanation
**Core Concept**
The patient's presentation of jaundice, right upper quadrant tenderness, and bile duct proliferation with intracanalicular bile stasis suggests a condition affecting the intrahepatic bile ducts. This scenario is characteristic of primary biliary cholangitis (PBC), a chronic autoimmune disease leading to progressive destruction of intrahepatic bile ducts.
**Why the Correct Answer is Right**
In PBC, the destruction of intrahepatic bile ducts leads to a reduction in bile salt excretion, causing a buildup of bile salts in the liver. This results in the activation of the enzyme gamma-glutamyltransferase (GGT), which is involved in the detoxification of bile salts. Elevated levels of GGT are a hallmark of PBC, making it a key diagnostic marker. The liver biopsy findings of bile duct proliferation and intracanalicular bile stasis support this diagnosis.
**Why Each Wrong Option is Incorrect**
**Option A:** Alkaline phosphatase (ALP) is also elevated in PBC, but it is not as specific as GGT for this condition.
**Option B:** Aspartate aminotransferase (AST) and alanine aminotransferase (ALT) are liver enzymes that can be elevated in various liver conditions, including PBC, but are not specific for this diagnosis.
**Option C:** Bilirubin levels may be elevated in PBC due to impaired bile salt excretion, but this is not a specific diagnostic marker for the condition.
**Clinical Pearl / High-Yield Fact**
PBC is a chronic autoimmune disease that often presents with non-specific symptoms, making it essential to consider this diagnosis in patients with unexplained elevation of serum GGT levels.
**Correct Answer:** C. Gamma-glutamyltransferase (GGT)
✓ Correct Answer: A. Alkaline phosphatase
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