Welcome msbelle

I do not have an answer to your question, but even if + you can take Tysabri for 2 years with very little to no risk of pml. It would be great if you are -
I have been in the indeterminate range for over a year. The range is .2 or less neg - .4 positive - I have been .24-.28 and most recent .21-.25.
Good luck!
Linda