Yes, as a matter of fact you can have RA with no rheumatoid
factor at all.
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At this stage the reason for rheumatoid factor is still
unknown.
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It seems that rheumatoid factor is the only name that is used
for it.
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Rheumatoid factor (RF or RhF) is an antibody that attacs an organism's own tissue. omos often found in About 80% of people with rheumatoid arthritis have detectable rheumatoid factor. Those who do not are said to be "seronegative".
Rheumatoid factor can also be a (antibody that precipitates on cooling of a blood sample); it can be either type 2 (monoclonal IgM to polyclonal IgG) or 3 (polyclonal IgM to polyclonal IgG)