Originally Posted by glenntaj

It is possible that this is a lab error; it's also true, though, that having thyroid conditions can raise CPK levels somewhat (decrease in T3, in particular, leads to rises in CPK) as can vigorous exercise, especially if muscle is damaged. Caffeine, interestingly enough, also leads to some elevation at times (one doctor I know says he always asks people to abstain from coffee for 24 hours before getting this test done).