Hi, thank for posting. Phospho-creatine kinase is an enzyme that takes part in tissue energy production. CPK is found in tissues that consume high energy. It is found in high amounts on skeletal muscle, brain, photoreceptor cells of the retina, hair cells, inner ear, spermatozoa, smooth muscle and on myocard. CPK level of 175 is in its maximal limit. High level of CPK shows tissue damage of the above organs. To determine the organ that is damaged, you need a CPK isoenzymes test. So you should consult your geneticist. Regards. Dr. Behar.