Which test is primarily used for the diagnosis of liver dysfunction?

Gamma-glutamyl transferase (GGT) is a specific enzyme that is particularly useful in evaluating liver function and diagnosing liver disorders. Elevated levels of GGT in the blood can indicate liver damage, cholestasis, and biliary obstructions. It reflects hepatobiliary function and can detect alcohol abuse or liver disease, making it a crucial marker in assessing liver health.

Creatinine, while important for evaluating kidney function, does not provide information about liver function. The lipid profile measures cholesterol and triglycerides, which relate to cardiovascular risk factors rather than liver health. Blood urea nitrogen (BUN) is also primarily associated with kidney function and does not indicate liver dysfunction directly. Therefore, GGT is the most relevant test when assessing liver function and diagnosing liver-related issues.