Rheumatoid Arthritis Support Group
Rheumatoid arthritis is a chronic, inflammatory, multisystem, autoimmune disorder. It is a disabling and painful condition which can lead to substantial loss of mobility due to pain and joint destruction. The disease is also systemic in that it often also affects many extra-articular tissues throughout the body including the skin, blood vessels, heart, lungs, and...

What does change are your CRP and SED rates -- numbers that indicate whether you have inflammation. I am one of those odd ducks whose RF and anti-ccp came back off the charts, and even while my hands were visibly inflamed, my inflammation markers came back negative/normal.
Go figure. The only way they will be able to tell if my meds are doing any good will be purely symptom-based.
I tested positive with a raised rheumatoid factor, but don't have RA (I have hypermobility syndrome which causes extensive joint pain, fatigue and multi-organ problems, but without the inflammation or stiff joints of RA).
My mum tested for a "very high" rheumatoid factor 10 years ago, but has no RA then or now.
A work colleague of mine was hospitalised for a month before they decided she had RA with no positive blood results, 7 years on she definitely has it.
So it goes both ways, false positive, false negative, its only one tool in the diagnosis box, its down to the experience of the rheumatologist to decide. Be glad you maybe don't have one aspect of the disease!