Question
As part of an in depth physical at the Mayo Clinic to determine the cause of
my year+ exhaustion, my CPK level came back out of range:  280, 305.  Is
this a cause for concern?  I don't know which kind of CPK level was tested.  I
was a healthy, exercising person (although with controlled Hashimoto's for 13
+ years,)  until this "crash set in last year.  There is no easily identifiable
reason for this test result.  I've been advised to wait a month and retest.  
Comments?  Thanks in advance, Julia

Answer
Sounds like the retest is a good idea, since elevated CPK levels can occur in a lot of conditions.  If you're still doing exercise, call and ask your doc how long in advance to stop exercising before the test.  This can also be a cause of elevated CPK.