Hepatic, Biliary and Pancreatic Pathology Quiz

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Which laboratory pattern is most characteristic of pre-hepatic jaundice?

A Raised unconjugated bilirubin with otherwise normal liver function tests ✓
B Markedly elevated alanine aminotransferase and aspartate aminotransferase
C Raised alkaline phosphatase with pruritus
D Raised conjugated bilirubin with pale stools and dark urine
E Normal bilirubin with isolated hypoalbuminaemia

The answer is A: Raised unconjugated bilirubin with otherwise normal liver function tests

Explanation

Why A is correct

See Pre-hepatic Jaundice. Option A is correct. Bilirubin is the yellow pigment made when haem (the iron-containing part of haemoglobin) from old red blood cells is broken down. The liver takes it up and conjugates it, attaching a sugar group so that it dissolves in water and can leave in bile. In pre-hepatic jaundice the problem arises before the liver: too many red cells are destroyed, as in haemolytic anaemia, or the conjugation step is inherently weak, as in Gilbert syndrome. The liver is overwhelmed by the load, so unconjugated bilirubin accumulates in the blood. Unconjugated bilirubin is not water soluble, so it cannot pass into the urine, which stays normal in colour, and the stools stay normal because bile flow is not blocked. The liver itself is healthy, so ALT, AST, ALP and albumin are normal. Remember that pre-hepatic means before the liver, with a healthy liver and unconjugated bilirubin.

Site of problem: before the liver, from excess red cell breakdown or weak conjugation.
Bilirubin: unconjugated bilirubin accumulates in the blood.
Urine and stools: unconjugated bilirubin is not water soluble, so urine and stools stay normal in colour.
Liver tests: ALT, AST, ALP and albumin are normal.

Why the other options are incorrect

B. Markedly elevated alanine aminotransferase and aspartate aminotransferase: Markedly raised ALT and AST show that liver cells have been damaged, as in viral hepatitis or alcohol-related liver disease. In pre-hepatic jaundice the liver is healthy, so the transaminases are normal. It would fit hepatocellular jaundice.
C. Raised alkaline phosphatase with pruritus: A raised ALP with itching points to cholestasis (blocked or slowed bile flow), so itching can occur. Pre-hepatic jaundice does not obstruct bile, so ALP and itch are not expected. It would be the answer for obstructive or cholestatic jaundice.
D. Raised conjugated bilirubin with pale stools and dark urine: Raised conjugated bilirubin with pale stools and dark urine is the pattern of biliary obstruction, because conjugated bilirubin spills into the urine and cannot reach the gut. In pre-hepatic jaundice the bilirubin is unconjugated, so the urine stays normal. This would be right for painless jaundice from a blocked bile duct.
E. Normal bilirubin with isolated hypoalbuminaemia: Normal bilirubin means there is no jaundice at all, and a low albumin alone points to poor protein production or poor nutrition. It would fit chronic liver disease or malnutrition, not a problem with bilirubin handling.

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More questions from this set. Start the quiz to answer them and see each explanation.

1
Which viral hepatitis has broadly curative oral direct-acting antiviral treatment but no effective licensed preventive vaccine?
2
A 29-year-old man with a history of long-standing ulcerative colitis is reviewed for abnormal liver blood tests showing a cholestatic pattern. He reports fatigue and intermittent pruritus but no abdominal pain. Which underlying pathological process best explains the liver disease most likely responsible for these findings?

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