No information at all for you, canoepa, I'm still new to this arthritis thing myself. I don't even have my official diagnosis yet, but since my fingers are starting to look like an old crone's fingers, I don't think there is much doubt. My RA test, which my GP did, came back normal. Unlike you, I didn't think to ask for actual figures, so I don't even know what the test tests, or what normal is.
I just wanted to post so you would know someone has read your question. I'll watch with interest the answers others give you.
Hugs,