One slightly elevated test and one joint isn't too much to worry about. If your still concerned and having an issue I would asked to be retested. I have been diagnosed with RA for about 4 years now.
I'm still in the early stages of getting a sleeve. I have an appointment to see the surgeon the 15th of next month. I feel like I have done enough research, I'm comfortable with the decision and would gladly have it done as soon as possible.