Positive ANA, rf <20, what does this mean?
My husband had joint pain for a couple of weeks. His ANA came back positive, but the RA factor came back < 20, with a ref range of < 21 as normal. His rbc sedation rate was normal. His dr is referring him to a rheumatologist due to the positive ANA.
His pain has been gone now for a few days. What does the < 20 mean? Since it was only one point under the ref range, is this still concerning?
Is it possible for a virus to cause a positive ANA? He was sick for a few days, had weird tingling, then the joint pain and stiffness that moved from his shoulders down thru the fingers and ankles, and now back to nothing in the span of about 3-4 weeks.