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I don't know a lot about nodules I don't know if it's possible to get rhumatoid nodules without having arthritis, but I'm going to comment on a couple of other things in your question. Approximately 20% of people with RA are what's called seronegative - this means that their blood tests don't show RA (for more on blood tests and what they mean, click here). The test are generally used to confirm a diagnosis, not as a deciding factor in the diagnosis. I would recommend you go back to see your doctor and insist on a referral to a rheumatologist to get checked out by a specialist.