I have had 3 since being first dx'd March of 2006. That was the one that told everyone I had MS, and wasn't just stress, or something else causing the numb/tingly hand I had for four years. I'm grateful my PCP finally ordered one!

I had one after a year on avonex, and had more and enhanced lesions, so a switch was made to Rebif. I was good on my third MRI on rebif, but I was having other trouble so was switched to Ty. My neuro hasn't said whether we'll do another this March. I see him in Jan, so I'll ask him then.