My son has experienced 3 tests for CPK values in turn 76, ~1000, ~2000. In which, 2 tests done by Pasteur Inst. and the results were given after 1 day. The rest done by Medic lab. All these labs are big and prestigious ones. My son is just 16 month old, able to walk from 10 month old, run and climb stairs well now, and not found any muscular weekness. He can walk without tiredness for at least 1 hour. I'm facing the scare of muscular dystrophy diseases (DMD, BMD). Anyone can tell me what problem with my son ? If i can trust the CPK test results ? I know a good lab somtimes can make mistake also and i know too the normal range of CPK should be 20-180 iu/l as well as DMD usually happen at 50-100 times normal but it is just "usually" not "always" or "for sure". I've known a man with his son at CPK of 8000 and it seams to be DMD. Please help and give me some advice. Thanks a lot.