I had a triphase bone scan during my first diagnosis with RSD in 2003 which clinched the RSD diagnosis for me (after multitudes of blood tests and xrays).

I'm a little concerned I'm already experiencing spread in my right arm. I'm starting to feel burning in my right shoulder and upper arm and intermittent prickling pain in my right hand. This is how the RSD started in my left arm. It's not anywhere near as intense as my left definite RSD arm. I'm not sure if I'm just being paranoid and I'm in so much pain that it feels like it's in the right arm, or it's starting to mirror.