Question 1

Which of the following best explains why the liver is the primary organ for detoxification of substances absorbed from the gastrointestinal tract?

Accepted Answer

The portal vein delivers nutrient-rich and toxin-laden blood directly from the gut to the liver before it enters systemic circulation.

Question 2

A patient presents with pale, chalky stools and dark orange-brown urine. Laboratory tests show elevated conjugated bilirubin in plasma, absent urobilinogen in urine, and a marked increase in ALP. Which condition is most likely?

Accepted Answer

Post-hepatic (obstructive) jaundice

Question 3

Which of the following statements about albumin is CORRECT?

Accepted Answer

Albumin is the most abundant plasma protein, maintains colloidal osmotic pressure, and is synthesized exclusively in the liver.

Question 4

A newborn develops severe jaundice within the first few days of life. Laboratory results show a marked increase in unconjugated bilirubin, but normal ALT, AST, ALP, and GGT. Which enzyme deficiency is most likely responsible?

Accepted Answer

UDP-glucuronyl transferase

Question 5

Which laboratory test is most specific for detecting hepatocellular damage?

Accepted Answer

ALT (Alanine Aminotransferase)

Question 6

A patient with advanced cirrhosis has near-normal ALT and AST levels, but shows marked increases in bilirubin and prothrombin time, and a significant decrease in albumin. What is the best explanation for the normal aminotransferase levels?

Accepted Answer

There is so much scar tissue that few hepatocytes remain to produce and leak ALT/AST.

Question 7

Which of the following best describes the fate of conjugated bilirubin in the intestine under normal physiological conditions?

Accepted Answer

It is converted by gut bacteria to urobilinogen, some of which is reabsorbed and excreted in urine as urobilin.

Question 8

Which of the following patterns is most characteristic of acute viral hepatitis in the early phase?

Accepted Answer

ALT and AST are dramatically elevated (\u003e50× normal), bilirubin rises slowly, ALP and GGT are only mildly elevated.

Question 9

Which of the following is TRUE regarding the measurement of prothrombin time (PT) as a liver function test?

Accepted Answer

PT is measured using plasma because clotting factors must be present.

Question 10

A patient presents with elevated total bilirubin, normal ALT/AST/ALP/GGT, and increased urinary urobilinogen. Which scenario best explains these findings?

Accepted Answer

Unconjugated hyperbilirubinaemia due to haemolysis

Question 11

Which of the following is a distinguishing feature of Dubin-Johnson syndrome compared to Gilbert's syndrome?

Accepted Answer

Dubin-Johnson syndrome involves defective excretion of conjugated bilirubin due to a transporter mutation, while Gilbert's syndrome involves decreased activity of UDP-glucuronyl transferase.

Question 12

Which of the following is the main reason why GGT (Gamma-Glutamyl Transferase) is considered a problematic marker for liver disease?

Accepted Answer

GGT is highly sensitive but not specific, as it is produced in multiple tissues and induced by many drugs.

Question 13

A patient with suspected liver disease has the following LFT results: ALP ↑↑↑, ALT/AST normal to mildly elevated, conjugated bilirubin ↑↑, urine urobilinogen absent, and pale stools. What is the most likely diagnosis?

Accepted Answer

Cholestasis due to biliary obstruction

Question 14

Which of the following best describes the principle of the Biuret test for total protein measurement?

Accepted Answer

Proteins with at least two peptide bonds react with $$\mathrm{Cu}^{2+}$$ ions under alkaline conditions to form a purple complex measured at $$\lambda = 540\ \mathrm{nm}.$$

Question 15

Which of the following is a key difference between plasma and serum in the context of laboratory testing?

Accepted Answer

Serum is preferred for most LFTs, while plasma is required for prothrombin time because it contains clotting factors.

Question 16

A patient with chronic hepatitis is being monitored. Which of the following LFT patterns is most likely to be observed?

Accepted Answer

ALT/AST ↑, ALP normal to decreased, albumin increased, prothrombin time normal to increased

Question 17

Which of the following is the correct sequence of events in the metabolism and excretion of bilirubin?

Accepted Answer

Haemoglobin breakdown → biliverdin → unconjugated bilirubin → conjugation in liver → excretion into bile → conversion to urobilinogen in gut → partial reabsorption and excretion as urobilin in urine

Question 18

Which of the following is a clinical implication of the liver's ability to regenerate?

Accepted Answer

A living donor can donate a portion of their liver, and both donor and recipient can regenerate a full-sized liver.

Question 19

Which of the following is TRUE regarding hepatitis C infection?

Accepted Answer

It leads to chronic disease in about 20% of cases over 20–30 years and there is currently no vaccine.

Question 20

A patient presents with elevated AST but normal ALT. Which of the following is the most likely explanation?

Accepted Answer

The elevated AST is likely due to non-hepatic causes such as myocardial infarction or muscle damage.

Liver Function and Testing: Structure, Metabolism, and Clinical Assessment

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