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My elevated CPK was running in the 900-1200 range for over 17 years before I was finally referred to a Rheumatologist who knew to check my lactic acid for a diagnosis of McArdles Disease, which is a glycogen storage disease. The lactic acid test is 2 parts. 1st they take a blood sample with you at rest then a blood pressure cup is put on your arm and they jack up the pressure. Then you sqeeze a ball repeatly for 2 minutes. Then they draw another sample. If your lactic acid is flat that says that your muscles lack the enzyme phosphorylase which allows your muscles to convert glycogen into glucose. There is no treatment or cure..but Vitamin B6 does help..along with having some hard candy for the availabiliy of sucrose..Neither will make your muscle pain go away but they will help a little bit...for me the B6 is the difference between being incapacipated and being able to at least enjoy a little bit of my retirement..I had to take disability.