Re: Lupus or Rheumatoid Arthritis?
Hi Angie~~ I am new to the forum. The only reason, I may be able to answer this ? for you is because I have been reading about lupus. Rheumatoid factor is actually produced by your body, that causes a chain reaction of bio chemical events that leads to cartilage and joint destruction. 1/3 of lupus patients have RH factor, which can aggravate the inflammation of joints but, may be protective of other tissues, such as the kidneys. That is good news for you. in that you may not have to worry about kidney involvement. So, it is possible to have lupus and Rh factor. The RH factor is positive in 80% of patients with rheumatoid arthritis. and in 20-30% of lupus patients w/SLE. When there are high levels of RH Factor and low levels of ANA, then rheumatoid athritis is the most likely Dx. There is a blood test called~Serum protein Electrophoresis If a broad band of gamma globulin is found, it confirms an autoimmune process.
Hope this helps. I am not a medical professional. Just offering, what I myself, have just learned.
Have a great day!!