A patient's CK-MB is reported as 18 µg/L and the total CK is 560 IU/L. What is the CK relative index (CKI)? Clinical Chemistry A patient's CK-MB is reported as 18 µg/L and the total CK is 560 IU/L. What is the CK relative index (CKI)? A) 30.0% B) 3.2% C) 10.0% D) 0.10% Answer: 3.2% Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+