2 months ago my RA factor was at 900.0 which is as high as the test would go. I was on cimza and it was working great for me but got an infection between my toes and had to have my middle toe amputated. Doc said that the cimza wouldn't cause the infection. Probably just Diabetes. He said the cimza would take about 3 months to start working but I noticed a big change I'm less than 2 weeks.

My factor was 24 and my Dr said it's just above the cut off. She still hasn't given me any new drugs after I had to stop methotrexate.

My factor for that test was 116. But I don’t think blood tests tell the whole story. Speak more with your doctor, and if he is not an RA doctor, be referred to one.

I would suggest talking with your doctor about your concerns over the testing ranges. Only your doctor will know the specifics of your particular test and can give you an accurate answer based on your situation.

To confuse you further...I don't have an elevated RF, infact it doesn't show in my bloods at all! I am sero negative! I thought, when first diagnosed, there was only rheumatoid and osteoarthritis. I now know there are variations on a theme!!
I wish you well on your journey and hope its just a knee injury!