Have they checked your heart? These results can indicate a condition residing there. It could be that you have high levels for no good reason, but I would want to be sure every possibility was fully explored before I accepted that as the final word.
I am not sure but I think they came back as MB.
Thyroid was checked all is fine, i'v been to the top 3 neurologists in the middle east and they told me that there is nothing wrong. They said that I have high CPK levels for no reason whatsoever. Plus it has been 20 years already with the same readings... dont you think some symptoms would have popped up already ? I dont have any symptoms, I run for 50 minutes everyday and benchpress 300lbs. I really dont know what else to consider .
I found a great explanation of CPK here
http://www.medhelp.org/posts/Urology/elevated-cpk-levels-what-is-it/show/225687. I also read that there can be false postives. Even with that possibility, I think some further exploration would be good. There are things that can cause high results that are not associated with heart, brain or muscle conditions. Has your thyroid been checked? Do you have any symptoms of any kind? Did the results come back as MB, MM or BB?