Why are liver function tests monitored with statins?

• A. To monitor kidney function
• B. To detect hepatotoxicity indicated by transaminase elevations (>3x ULN)
• C. To measure lipid profile
• D. To assess thyroid function

Answer: (B)

Liver safety is the focus when monitoring statins because these drugs are processed in the liver and, in rare cases, can cause hepatocellular injury. The most informative markers are the transaminases, ALT and AST; when liver cells are harmed, these enzymes spill into the bloodstream. A rise greater than three times the upper limit of normal signals potential hepatotoxicity and prompts further evaluation, possible cessation of the statin, and monitoring. This approach specifically targets detecting drug-induced liver injury rather than evaluating kidney function, lipid levels for efficacy, or thyroid function. Baseline liver tests help identify preexisting liver disease, while subsequent testing is guided by enzyme elevations or symptoms.