Which of the following is NOT included in a liver function test?

Appeared in: RIMS Nursing Officer - 2022

Explanation

Pepsin is the correct answer as it is not included in a liver function test panel.
Pepsin is a proteolytic enzyme, meaning it breaks down proteins into smaller peptides.
It is produced in the chief cells of the stomach lining and functions in the highly acidic environment of the stomach, not the liver.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Components of a Liver Function Test (LFT) panel as background academic context rather than a clinical decision trigger.
Understanding the components of an LFT panel is crucial for nurses to interpret lab results and anticipate patient needs. Abnormal LFTs can signal serious conditions like hepatitis, cirrhosis, or drug-induced liver injury.
A nurse observing a prolonged PT and low albumin in a patient's chart should immediately implement bleeding precautions (e.g., using a soft-bristled toothbrush, avoiding unnecessary injections) and monitor for signs of fluid overload like edema and ascites.
What if? If a patient has elevated ALT and AST but normal albumin and PT, it suggests an acute liver injury (like viral hepatitis or a drug reaction) rather than chronic, long-standing liver disease. The nursing focus would be on identifying the acute cause and managing symptoms.

How to Approach the Question

First, identify the core of the question, which is to find the test that is NOT related to liver function.
The question uses the negative keyword 'NOT', so you are looking for the outlier among the options.
Recall the main functions of the liver: synthesis (proteins like albumin, clotting factors), metabolism, detoxification, and excretion (bilirubin).
Evaluate each option against these functions.
Prothrombin time relates to clotting factors (synthesis). Albumin is a protein (synthesis). Bilirubin relates to excretion.
Pepsin is a digestive enzyme from the stomach. It does not fit with the known functions of the liver. Therefore, it is the correct answer.

Concept Tested & Keywords

Concept Tested: Components of a Liver Function Test (LFT) panel
Stem keywords: liver function test, NOT included
Lead-in keywords: NOT
Negative lead-in flag: The question asks to identify the option that is NOT part of a standard Liver Function Test (LFT). This requires knowing the standard components of an LFT panel and eliminating the one that does not belong.

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E6 Physiology Guyton 4SAE Part 2A p. 186-188

E6 Pathology-Textbook of PATHOLOGYHarsh Mohan Part 3 (515-969) p. 88-90

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