In common bile duct obstruction, which change occurs in urine coloration?

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Study for the NCLEX Hepatic and Biliary Exam. Enhance your knowledge with flashcards and multiple choice questions, featuring hints and explanations. Get prepared and boost your confidence for test day!

Multiple Choice

In common bile duct obstruction, which change occurs in urine coloration?

Explanation:
Blockage of the common bile duct prevents bile from reaching the intestine, so conjugated bilirubin backs up into the bloodstream and is excreted by the kidneys. Because conjugated bilirubin is water-soluble, it colors the urine dark amber to brown. This is why dark-colored urine is seen with obstructive jaundice. Light-colored urine would suggest lack of bilirubin in urine, foamy urine points to proteinuria, and cloudy urine usually hints at infection or crystals, not a bilirubin-related obstruction.

Blockage of the common bile duct prevents bile from reaching the intestine, so conjugated bilirubin backs up into the bloodstream and is excreted by the kidneys. Because conjugated bilirubin is water-soluble, it colors the urine dark amber to brown. This is why dark-colored urine is seen with obstructive jaundice. Light-colored urine would suggest lack of bilirubin in urine, foamy urine points to proteinuria, and cloudy urine usually hints at infection or crystals, not a bilirubin-related obstruction.

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