21st February 2024

A 55 year old man returns to his GP 4-weeks after beginning Atorvastatin to reduce his high cholesterol.

A 55 year old man returns to his GP 4-weeks after beginning Atorvastatin to reduce his high cholesterol. He reports good compliance with the medication however has noticed aching in his upper and lower limbs which is starting to bother him. You decide to take a blood test.

Which one parameter, from the following options, would be most important to check in this patient?