Serum lab value

An increase in which serum lab value indicates to the nurse that a prescription for atorvastatin is having the desired effect for a client at risk for coronary artery disease?

A. Creatine phosphokinase (CK)

B. Low-density lipoprotein (LDL)

C. High-density lipoprotein(HDL)

D. Prothrombin time (PT)