What is seronegative rheumatoid arthritis?
“Seronegative” means rheumatoid factor is not present in the blood.
Rheumatoid factor is a protein found in the blood of 80% of people with rheumatoid arthritis.
That means 20% of people with RA don’t have rheumatoid factor (duh)!
But… there are many other kinds of arthritis that can look like rheumatoid arthritis! Which
means a careful diagnostic workup is needed to be absolutely sure it really is seronegative
RA! Just to be sure! The good news is that seronegative RA is treated
just like seropositive RA! And… it appears to have a better prognosis!