Which of the following does not come under Liver Function Test?

NHM MP Staff Nurse - 2015

Biochemistry & Nutrition

Easy

Appeared in: NHM MP Staff Nurse - 2015

Explanation

Creatinine is a chemical waste product of creatine, which is used for energy production in muscles.
The kidneys are responsible for filtering creatinine from the blood and excreting it in the urine.
Elevated serum creatinine levels are a specific indicator of impaired kidney (renal) function, as they suggest the kidneys are not filtering waste effectively.
It is not used to assess the function of the liver.

Option A: Bilirubin is a key component of LFTs. It is a yellow pigment formed from the breakdown of red blood cells. The liver processes bilirubin, so its levels indicate how well the liver is conjugating and excreting it.
Option B: SGOT (Serum Glutamic-Oxaloacetic Transaminase), also known as AST (Aspartate Aminotransferase), is an enzyme found in the liver, heart, and other muscles. Its levels are measured as part of an LFT panel to detect liver cell damage.
Option C: SGPT (Serum Glutamic-Pyruvic Transaminase), also known as ALT (Alanine Aminotransferase), is an enzyme found primarily in the liver. It is considered a more specific marker for liver injury than AST, making it a standard part of LFTs.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Differentiating between liver function tests and kidney function tests as background academic context rather than a clinical decision trigger.
Nurses must differentiate between LFTs and renal function tests to correctly interpret lab results and monitor for organ-specific adverse effects of medications.
Many drugs are either hepatotoxic (damage the liver) or nephrotoxic (damage the kidneys). Knowing which lab value corresponds to which organ is crucial for patient safety and timely intervention.
For example, a patient on a nephrotoxic antibiotic like gentamicin would be monitored using serum creatinine, while a patient on a hepatotoxic drug like high-dose paracetamol would be monitored with LFTs (AST/ALT).

How to Approach the Question

First, identify the core subject of the question, which is 'Liver Function Test' (LFT).
Next, notice the negative keyword 'does not'. This means you are looking for the option that is NOT an LFT.
Review each option and recall its primary function.
Option A, Bilirubin, is related to liver processing. It's likely an LFT.
Option B, SGOT (AST), is a liver enzyme. It's likely an LFT.
Option C, SGPT (ALT), is a liver-specific enzyme. It's definitely an LFT.

Concept Tested & Keywords

Concept Tested: Differentiating between liver function tests and kidney function tests.
Stem keywords: Liver Function Test, Bilirubin, SGOT, SGPT, Creatinine
Lead-in keywords: does not
Negative lead-in flag: This is a negative-framed question asking you to identify the option that does NOT belong.

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