Which laboratory parameter is primarily monitored to detect potential liver injury when taking atorvastatin?

• A. Liver function tests
• B. Kidney function tests
• C. Thyroid function tests
• D. Complete blood count

Answer: (C)

Monitoring liver function tests is key here. Atorvastatin can affect the liver, and while serious injury is rare, baseline liver tests before starting treatment and periodic monitoring during therapy help catch hepatotoxicity early. Liver function tests measure enzymes like ALT and AST and bilirubin; a rise in these values indicates potential liver injury and would prompt further evaluation or action, such as retesting or stopping the medication if levels are markedly elevated or if symptoms (like jaundice or dark urine) appear. The other options assess kidney function, thyroid function, or complete blood counts, which are not the primary measures for detecting statin-related liver injury.