The normal value of CPK in serum varies between HomeEnzymology MCQsThe normal value of CPK in serum varies betweenQ. The normal value of CPK in serum varies betweenA. 4–60 IU/LB. 60–250 IU/LC. 4–17 IU/LD. > 350 IU/L Answer: 4–60 IU/L