In biliary obstruction, which laboratory result is typically decreased?

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Enhance your knowledge with the Ciulla Clinical Chemistry Test. Study with interactive quizzes, featuring flashcards and multiple-choice questions. Each question offers hints and explanations for better understanding. Prepare effectively and excel in your exam!

Multiple Choice

In biliary obstruction, which laboratory result is typically decreased?

Explanation:
Blockage of the bile ducts prevents bile, including conjugated bilirubin, from reaching the intestine. Without bile in the gut, intestinal bacteria have less bilirubin to convert into urobilinogen, so fecal urobilinogen decreases. This is why stool can appear lighter and why the amount of urobilinogen in stool drops. In contrast, bilirubin builds up in the blood and is shed into urine as conjugated bilirubin, so urine bilirubin and direct (conjugated) bilirubin in serum increase, and total bilirubin rises. Thus, fecal urobilinogen is typically decreased in biliary obstruction.

Blockage of the bile ducts prevents bile, including conjugated bilirubin, from reaching the intestine. Without bile in the gut, intestinal bacteria have less bilirubin to convert into urobilinogen, so fecal urobilinogen decreases. This is why stool can appear lighter and why the amount of urobilinogen in stool drops. In contrast, bilirubin builds up in the blood and is shed into urine as conjugated bilirubin, so urine bilirubin and direct (conjugated) bilirubin in serum increase, and total bilirubin rises. Thus, fecal urobilinogen is typically decreased in biliary obstruction.

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