wow tracy - that is awful!!!!!! I just can't stand how close minded some providers can be! Wow!!!! Of course IVIG and mestinon would affect the results - if they improve your muscle function - the tests will therefor show improved muscle function - how someone can't grasp that concept, especially someone educated is beyond me! Mayo labs can be wrong just like any other labs- no one is perfect... and 4 other positive labs - wow.... I hope that didnt' affect your treatment plan ultimately - seeing that physician!!!