I too am a negative, but I was referred to my rheumy by my primary Dr., after I said that my fingers swelled up every night, and had since I was a teen. Luckily my rheumy diagnosed me on my symptoms alone. I think he calls me Seronegative Spondylarthropathy. I just had X-rays of my feet which showed a bone spur on each heel, which he said indicated that there has been inflammation there for some time. Weird, because while I have pain in plenty of other places, I've never had any heel pain. Just goes to show you how sneaky this disease is.