My question is about MuSK but I don;t know if you can help Annie. I had a test years ago and was told it was negative. I had 0.02, and was 4 SD away from a result. Anything >0.6 is a result. So my question is ... could the low dose steroids I was taking at the time have affected this test ? The Neuro said "no" but somehow I can't quite believe... I have just reread the result and they mention that 3 SD is allowed ... so I basically missed a dx due to 1 Standard Deviation ?