There are three types of Creatine kinase that are used as diagnostics
CK-I, or BB, is produced primarily by brain and smooth muscle.
CK-II, or MB, is produced primarily by heart muscle.
CK-III, or MM, is produced primarily by skeletal muscle.
Elevation of CK-I may be seen in stroke, extreme shock, or brain tumor
Elevation of CK-II is seen after a myocardial infarction. It begins to rise 3-6 hours after the heart attack, and may peak within 24 hours. It should then return to normal. For this reason, it is a useful marker for recent myocardial infarction, but not for one which occurred more than a day before the test
Elevation of CK-III indicates skeletal muscle damage. This may occur from normal exercise, from trauma, or from muscle disease. Hypothyroidism may also cause elevated CK
I hope this helps. As your physician what your ratio are and that will give you a better understanding of what is going on.
CK-I: 0%
CK-II: 0-5%
CK-III: 95-100%.
You should only be concerned if you have elevated CK-I or CK-II