Even though there is no blood test for fibromyalgia, blood tests are important to exclude other medical conditions. Therefore, thyroid hormone and calcium blood levels are obtained to exclude hypercalcemia, hyperparathyroidism, and hypothyroidism. The blood alkaline phosphatase (a bone enzyme) level is often raised in patients with Paget's disease of the bone. The CPK (a muscle enzyme) level is often elevated in patients with polymyositis, a disease with diffuse muscle inflammation. Therefore, obtaining alkaline phosphatase and CPK blood levels can help the doctor decide whether Paget's disease and polymyositis are the causes of bone and muscle pains.
Polymyositis can have similar symptoms that mimic fibromyaliga. If you haven't been tested for this you may want to talk to your physician about it. But there isn't anything I have come across that links high CPK to fibo. I'm waiting to see if anyone else has had this same situation.
Best wishes.
google CPK FIBROMYALGIA
it is supposed to be elevated in patients with this disease . Hope this helps